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

Example Input: Which US state was the title of a no. 1 hit for the Bee Gees in 1967?
Example Output: bee gees

Example Input: Which country on the West African coast lies between The Democratic Republic of the Congo and Namibia?
Example Output: democratic republic of the congo

Example Input: Which place between York and Knaresborough in the UK was the site of a decisive battle in 1642 when Cromwell defeated Royalist forces?
Example Output:
oliver cromwell