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

Input: Consider Input: Physics. What is the SI unit for amount of substance?

Output: amount of substance


Input: Consider Input: Ewart was the middle name of which British Prime Minister?

Output: prime minister of the united kingdom


Input: Consider Input: Who became the presenter of the UK television show 'Antiques Roadshow' in 2008?


Output: antiques roadshow