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

Input: Consider Input: What are Proxima Centauri, Sirius A, Pollux, Arcturus and Betelgeuse?

Output: arcturus

Input: Consider Input: The town of Anthony in which US state was known as 'The Leap Year Capital of the World'?

Output: united states

Input: Consider Input: Who was the Prime Minister of Canada from 1968 to 1979?
Output: canada