user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Competition record' regarding 'Sanya Richards-Ross'
Table Content:
| Year | Competition | Venue | Position | Event | Notes |
| --- | --- | --- | --- | --- | --- |
| Representing the United States | Representing the United States | Representing the United States | Representing the United States | Representing the United States | Representing the United States |
| 2002 | World Junior Championships | Kingston, Jamaica | 3rd | 200m | 23.09 (wind: -0.2 m/s) |
| 2002 | World Junior Championships | Kingston, Jamaica | 2nd | 400m | 51.49 |
| 2002 | World Junior Championships | Kingston, Jamaica | 3rd (h) | 4 × 400 m relay | 3:35.84 |
| 2003 | World Championships | Paris, France | 11th (sf) | 400 m | 51.32 |
| 2003 | World Championships | Paris, France | 1st | 4 × 400 m relay | 3:22.63 |
| 2004 | Olympic Games | Athens, Greece | 6th | 400 m | 50.19 |
| 2005 | World Championships | Helsinki, Finland | 2nd | 400 m | 49.74 |
| 2005 | World Athletics Final | Monaco | 1st | 400 m | 49.52 |
| 2006 | World Indoor Championships | Moscow, Russia | 9th (sf) | 400 m | 52.46 |
| 2006 | World Athletics Final | Stuttgart, Germany | 2nd | 200 m | 22.17 |
| 2006 | World Athletics Final | Stuttgart, Germany | 1st | 400 m | 49.25 |
| 2006 | World Cup | Athens, Greece | 1st | 400 m | 48.70 |
| 2006 | World Cup | Athens, Greece | 1st | 200 m | 22.23 |
| 2007 | World Championships | Osaka, Japan | 5th | 200 m | 22.70 |
| 2007 | World Championships | Osaka, Japan | 1st | 4 × 400 m relay | 3:18.55 |
| 2008 | Olympic Games | Beijing, China | 3rd | 400 m | 49.93 |
| 2008 | Olympic Games | Beijing, China | 1st | 4 × 400 m relay | 3:18.54 |
| 2009 | World Championships | Berlin, Germany | 1st | 400m | 49.00 |
| 2009 | World Championships | Berlin, Germany | 1st | 4 × 400 m relay | 3:17.83 |
| 2011 | World Championships | Daegu, South Korea | 7th | 400 m | 51.32 |
| 2011 | World Championships | Daegu, South Korea | 1st | 4 × 400 m relay | 3:18.09 |
| 2012 | World Indoor Championships | Istanbul, Turkey | 1st | 400 m | 50.79 |
| 2012 | World Indoor Championships | Istanbul, Turkey | 2nd | 4 × 400 m relay | 3:28.79 |
| 2012 | Olympic Games | London, United Kingdom | 5th | 200 m | 22.39 |
| 2012 | Olympic Games | London, United Kingdom | 1st | 400 m | 49.55 |
| 2012 | Olympic Games | London, United Kingdom | 1st | 4 × 400 m relay | 3:16.88 |
| 2014 | World Relay Championships | Nassau, Bahamas | 1st | 4 × 400 m relay | 3:21.73 |
| 2015 | World Relay Championships | Nassau, Bahamas | 1st | Distance medley relay | 10:36.50 (WR) |
| 2015 | World Relay Championships | Nassau, Bahamas | 1st | 4 × 400 m relay | 3:19.39 |
| 2015 | World Championships | Beijing, China | 2nd | 4 × 400 m relay | 3:19.44 |


Question
What was Richards-Ross personal record for the 400m event during the London Olympics? 


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["At the 2012 London Olympics, Richards-Ross finished the 400m in 49.55 and won the gold medal."]