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

Ex Input:
The Church of the Savior on Spilled Blood, built on the site of the assassination of Tsar Alexander II, is in which Russian city?

Ex Output:
church of the savior on blood


Ex Input:
Will you still be sending me a valentine is a line from which Beatles song?

Ex Output:
the beatles


Ex Input:
As at 2008 which corporation owns the brands Duracell, Braun and Gillette?

Ex Output:

duracell