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

Example Input: Which group of the 1970's featured Tony Iommi on guitar, Geezer Butler on bass and Bill Ward on drums?
Example Output: geezer butler

Example Input: Who won the Women's Singles at the 2015 Australian Open Tennis Championships?
Example Output: the championships, wimbledon

Example Input: What is the name of the gland in the human body attached to the base of the brain important in controlling growth?
Example Output:
brain