user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Achievements' regarding 'Oscar Cortínez'
Table Content:
| Year | Competition | Venue | Position | Event | Notes |
| --- | --- | --- | --- | --- | --- |
| Representing Argentina | Representing Argentina | Representing Argentina | Representing Argentina | Representing Argentina | Representing Argentina |
| 1991 | South American Junior Championships | Asunción, Paraguay | 3rd | 1500 m | 4:00.7 |
| 1991 | South American Junior Championships | Asunción, Paraguay | 4th | 5000 m | 15:32.9 |
| 1992 | World Junior Championships | Seoul, South Korea | 5th | 10,000 m | 29:31.80 |
| 1993 | South American Cross Country Championships | Cali, Colombia | — | 12 km | - |
| 1993 | World Cross Country Championships | Amorebieta, Spain | 166th | 11.75 km | 36:24 |
| 1996 | South American Cross Country Championships | Asunción, Paraguay | 12th | 12 km | 40:20 |
| 2000 | Olympic Games | Sydney, Australia | 58th | Marathon | 2:25:01 |
| 2001 | South American Cross Country Championships | Rio de Janeiro, Brazil | 1st | 4 km | 11:25 |
| 2001 | World Cross Country Championships | Oostende, Belgium | 47th | 4.1 km | 13:35 |
| 2001 | World Cross Country Championships | Oostende, Belgium | — | 12.3 km | DNF |
| 2002 | South American Half Marathon Championships | Buenos Aires, Argentina | 1st | Half marathon | 1:05:40 |
| 2002 | World Cross Country Championships | Dublin, Ireland | 101st | 4.208 km | 13:37 |
| 2002 | World Cross Country Championships | Dublin, Ireland | 109th | 11.998 km | 39:03 |
| 2003 | Buenos Aires Marathon | Buenos Aires, Argentina | 1st | Marathon | 2:17:50 |
| 2004 | Buenos Aires Marathon | Buenos Aires, Argentina | 1st | Marathon | 2:21:22 |
| 2009 | South American Marathon Championships | Buenos Aires, Argentina | 2nd | Marathon | 2:20:06 |


Question
In what competition was Oscar Cortínez the winner in 2003 and 2004?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Oscar Cortínez was the winner of the Buenos Aires Marathon in 2003 and 2004."]