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

Example Input: Which country mainly makes up the Horn of Africa?
Example Output: africa

Example Input: Which four letter word beginning with 'F' is a white crumbly Greek cheese, made from sheep's or goats milk and cured in brine?
Example Output: sheep

Example Input: What is the title of the 1866 operetta that Sullivan composed without Gilbert to a libretto by F C Burnand?
Example Output:
arthur sullivan