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?
Sentence (from "Mladen Krstajić"): Mladen Krstajić (Serbian Cyrillic: Младен Крстајић; born 4 March 1974) is a former Serbian footballer who played as a centre back.
Relevant evidence: Yes