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

[Q]: 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?
[A]: stade roland garros


[Q]: Chris Martin is the lead singer with which band who had several hits in the 2000s?
[A]: chris martin


[Q]: Chad shares the vast majority of its eastern border with which country?
[A]:
chad