TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What is the second largest of the Balearic Islands ?

SOLUTION: balearic islands

PROBLEM: Which country mainly makes up the Horn of Africa?

SOLUTION: africa

PROBLEM: Which US state borders Canada and the Connecticut River, and has the Green Mountains running through its centre?

SOLUTION:
connecticut river