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

[EX Q]: 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 A]: church of the savior on blood

[EX Q]: Mr Barkis, Edward Murdstone and Tommy Traddles are all characters in which Charles Dickens novel?
[EX A]: charles dickens

[EX Q]: Who was the second son of Adam and Eve and was murdered by his brother?
[EX A]:
eve