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

Example Input: Who is the current Australian prime minister ?
Example Output: australia

Example Input: Allopurinol is typically prescribed for which illness?
Example Output: allopurinol

Example Input: At the Battle of Bannockburn, an army led by Robert the Bruce defeated troops led by whom?
Example Output:
battle of bannockburn