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

Example Input: Which poem by Keats and novel by Disraeli both have the same title?
Example Output: john keats

Example Input: Harry, Tom, Dougie and Danny are collectively known as who in the pop world?
Example Output: dougie poynter

Example Input: What organization was led by Boutros Boutros-Ghali and Kofi Annan?
Example Output:
boutros boutros-ghali