Question: Who managed the football club that earned a nickname due to being the only English club to go a 38-match league season unbeaten?
Sentence (from "Arsenal F.C."): The club has won 13 League titles, a record 13 FA Cups, two League Cups, the League Centenary Trophy, 15 FA Community Shields, one UEFA Cup Winners' Cup and one Inter-Cities Fairs Cup.
Relevant evidence: No