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

Q: On which date do we celebrate 'Boxing Day'?

A: boxing day
****
Q: Which SF author wrote The Day it Rained Forever?

A: the day it rained forever
****
Q: What city will host the 2016 Olympics?

A:
2016 summer olympics
****