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

Which former Blue Peter presenter died in April 2004, aged 41?
blue peter

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?
stade roland garros

What famous author wrote many plays but just one novel, The Picture of Dorian Gray?
the picture of dorian gray