user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Olympic and World Championship results' regarding 'Yuliya Yefimova'
Table Content:
| Year | Competition | Venue | Position | Event | Notes |
| --- | --- | --- | --- | --- | --- |
| Representing Russia | Representing Russia | Representing Russia | Representing Russia | Representing Russia | Representing Russia |
| 2008 | Olympic Games | Beijing, China | 4th | 100 m breaststroke | 1:07.43 |
| 2008 | Olympic Games | Beijing, China | 5th | 200 m breaststroke | 2:23.76 |
| 2008 | Olympic Games | Beijing, China | 5th | 4 × 100 m medley relay | 3:57.84 |
| 2009 | World Championships | Rome, Italy | 1st | 50 m breaststroke | 30.09 |
| 2009 | World Championships | Rome, Italy | 2nd | 100 m breaststroke | 1:05.41 |
| 2009 | World Championships | Rome, Italy | 14th (sf) | 200 m breaststroke | 2:26.39 |
| 2011 | World Championships | Shanghai, China | 2nd | 50 m breaststroke | 30.49 |
| 2011 | World Championships | Shanghai, China | 4th | 100 m breaststroke | 1:06.56 |
| 2011 | World Championships | Shanghai, China | 2nd | 200 m breaststroke | 2:22.22 |
| 2011 | World Championships | Shanghai, China | 4th | 4 × 100 m medley relay | 3:57.38 |
| 2012 | Olympic Games | London, United Kingdom | 7th | 100 m breaststroke | 1:06.98 |
| 2012 | Olympic Games | London, United Kingdom | 3rd | 200 m breaststroke | 2:20.92 |
| 2012 | Olympic Games | London, United Kingdom | 4th | 4 × 100 m medley relay | 3:56.03 |
| 2013 | World Championships | Barcelona, Spain | 1st | 50 m breaststroke | 29.52 |
| 2013 | World Championships | Barcelona, Spain | 2nd | 100 m breaststroke | 1:05.02 |
| 2013 | World Championships | Barcelona, Spain | 1st | 200 m breaststroke | 2:19.41 |
| 2013 | World Championships | Barcelona, Spain | 3rd | 4 × 100 m medley relay | 3:56.47 |
| 2015 | World Championships | Kazan, Russia | 3rd | 50 m breaststroke | 30.13 |
| 2015 | World Championships | Kazan, Russia | 1st | 100 m breaststroke | 1:05.66 |
| 2015 | World Championships | Kazan, Russia | 17th (h) | 200 m breaststroke | 2:26.11 |
| 2015 | World Championships | Kazan, Russia | 5th | 4 × 100 m mixed medley relay | 3:44.83 |
| 2016 | Olympic Games | Rio de Janeiro, Brazil | 2nd | 100 m breaststroke | 1:05.50 |
| 2016 | Olympic Games | Rio de Janeiro, Brazil | 2nd | 200 m breaststroke | 2:21.97 |
| 2016 | Olympic Games | Rio de Janeiro, Brazil | 6th | 4 × 100 m medley relay | 3:55.66 |
| 2017 | World Championships | Budapest, Hungary | 2nd | 50 m breaststroke | 29.57 |
| 2017 | World Championships | Budapest, Hungary | 3rd | 100 m breaststroke | 1:05.05 |
| 2017 | World Championships | Budapest, Hungary | 1st | 200 m breaststroke | 2:19.64 |
| 2017 | World Championships | Budapest, Hungary | 14th (sf) | 200 m individual medley | 2:12.88 |
| 2017 | World Championships | Budapest, Hungary | 2nd | 4 × 100 m medley relay | 3:53.38 |
| (#) Indicates overall position achieved in the qualifying heats (h) or semifinals (sf) | (#) Indicates overall position achieved in the qualifying heats (h) or semifinals (sf) | (#) Indicates overall position achieved in the qualifying heats (h) or semifinals (sf) | (#) Indicates overall position achieved in the qualifying heats (h) or semifinals (sf) | (#) Indicates overall position achieved in the qualifying heats (h) or semifinals (sf) | (#) Indicates overall position achieved in the qualifying heats (h) or semifinals (sf) |


Question
What's Yefimova's best achievement in 2015?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["In 2015 Yefimova won the gold medal in 100 m at the World Championships in 1:05.66."]