instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who wrote and recorded the original version of the song Blue Suede Shoes which was a hit single for Elvis Presley in 1955?
answer:
blue suede shoes


question:
The Church of the Savior on Spilled Blood, built on the site of the assassination of Tsar Alexander II, is in which Russian city?
answer:
church of the savior on blood


question:
'Now what I want is, Facts' is the opening line of which Charles Dickens novel?
answer:

charles dickens