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

Example Input: Court Philippe Chatrier, which has stands named after Jacques Toto Brugnon, Jean Borotra, Henri Cochet, and Ren Lacoste, is the main court of an international tennis venue in which city?
Example Output: stade roland garros

Example Input: What is the main river of Brazil?
Example Output: brazil

Example Input: Which pop group consists of Alex Turner, Jamie Cook, Matt Helders and Nick O'Malley?
Example Output:
nick o'malley