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

What is the country of origin of the cheese called caerphilly?
caerphilly cheese

Which country has 6 time zones called Pacific, Mountain, Central, Eastern, Atlantic and Newfoundland?
newfoundland and labrador

In which city will the 2020 Summer Olympics be held?

2020 summer olympics