TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: The Church of the Savior on Spilled Blood, built on the site of the assassination of Tsar Alexander II, is in which Russian city?

SOLUTION: church of the savior on blood

PROBLEM: The site of the 1461 Battle of Mortimer's Cross lies in which English county?

SOLUTION: battle of mortimer's cross

PROBLEM: Who wrote the music for the musical (and later, film) Cabaret?

SOLUTION:
cabaret