Question:  What is the name of the city where West Ham United plays and has had only fifteen permanent F.C. managers including English football manager and former professional player?
Sentence (from "West Ham United F.C. managers"): Former player Kevin Keen has been caretaker manager twice; immediately prior to Gianfranco Zola's appointment in 2008 and after the sacking of Avram Grant in 2011.
Relevant evidence: No