Task: Explanation
Input (English): Mladen Krstajić (Serbian Cyrillic: Младен Крстајић; born 4 March 1974) is a former Serbian footballer who played as a centre back. He was known for his composure, leadership and defensive ability. He represented Serbia and Montenegro at the 2006 FIFA World Cup. Question: What two countries were represented by former Werder Premen member Mladen Krstajić at FIFA 2006? Answer: Serbia and Montenegro
Output (English):  He represented Serbia and Montenegro at the 2006 FIFA World Cup.