Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Brasilia is the capital but which city in Brazil has the largest population?
brazil

In which range of mountains are the two highest peaks Aconcagua and Ojos Del Salado?
aconcagua

Appointed on June 22nd 2011 who is the current manager of Birmingham City FC?

birmingham city f.c.