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

Example Input: In 1459, the Battle of Blore Heath in Staffordshire, England, 2 miles east of Market Drayton in Shropshire, was the first major battle of which campaign?
Example Output: england

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

Example Input: Anthracite is a type of what?
Example Output:
anthracite