Question: Which country won the 2008 WAFU U-20 Championship at the Jay Jay Okocha Stadium?
Sentence (from "2016 OFC U-20 Championship"): The 2016 OFC U-20 Championship was the 13th edition of the OFC U-20 Championship, the biennial international youth football tournament organized by the Oceania Football Confederation (OFC) for players aged 19 and below (despite the name remaining as U-20 Championship).
Relevant evidence: No