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

Example input: Who was the first American President?
Example output: president of the united states
Example explanation: The question talks about the president of the USA.
Q: The group Smile, formed in 1968 by Roger Taylor, Tim Staffel and Brian May, changed their name to what after Tim Staffel was replaced as vocalist?
A:
brian may