Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Venue | Score | Result | Competition |
| --- | --- | --- | --- | --- |
| September 29, 2003 | Incheon | 1 goal | 16-0 | 2004 AFC Asian Cup qualification |
| October 21, 2003 | Muscat | 1 goal | 1-3 | 2004 AFC Asian Cup qualification |
| October 24, 2003 | Muscat | 1 goal | 7-0 | 2004 AFC Asian Cup qualification |
| January 15, 2005 | Los Angeles | 1 goal | 1-2 | Friendly match |
| January 22, 2005 | Carson | 1 goal | 1-1 | Friendly match |
| June 8, 2005 | Kuwait City | 1 goal | 4-0 | 2006 FIFA World Cup qualification |
Question:
What was the competition on October 21, 2003?
Answer:
2004 AFC Asian Cup qualification