Question: SV Werder Bremen won its first ever German double, clinching both Bundesliga and the DFB-Pokal, Werder lost both Aílton and defensive senior talisman Mladen Krstajić to Schalke 04, Krstajić is a former Serbian footballer who played as a centre back, born on which date?
{'answer': '4 March 1974', 'supporting_facts': [['2003–04 SV Werder Bremen season', 4], ['Mladen Krstajić', 0]]}