instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What nationality was Che Guevara?
answer:
che guevara


question:
'Arthur Clennam', 'Jeremiah Flintwinch', and 'Edward Sparkler' are all characters in which Dickens' novel?
answer:
arthur clennam


question:
A candela is a measure of what?
answer:

candela