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 "1991–92 SV Werder Bremen season"): They participated in the Bundesliga, DFB-Pokal and the European Cup Winners' Cup.
Relevant evidence: No