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

Which Best Picture nominated movie tells the story of US soldier, 'Chris' Kyle?
chris kyle

Which film actor became mayor of Carmel, California in 1986?
carmel-by-the-sea, california

Prior to 2005 Alesha Dixon was a member of which girl band?

alesha dixon