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

Input: Consider Input: Which 20th century British prime minister had the longest surname ?

Output: prime minister of the united kingdom


Input: Consider Input: The Briish Airways subsidiary BA Connect was sold to which other airline?

Output: airline


Input: Consider Input: How were Plcido Domingo, Jos Carreras and Luciano Pavarotti known collectively?


Output: placido domingo