TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which was the title of the 7th and final book in the Chronicles of Narnia by C.S. Lewis?

SOLUTION: the chronicles of narnia

PROBLEM: What is the name of the main thoroughfare in Barcelona, which runs from the Placa de Catalunya to the sea?

SOLUTION: barcelona

PROBLEM: Which wars began with the Battle of St. Albans and finished with the Battle of Bosworth?

SOLUTION:
battle of bosworth field