instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Chep Lap Kok airport is located where?
answer:
hong kong international airport

question:
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?
answer:
stade roland garros

question:
In which long running BBC series did Bonnie Langford play the part of Melanie?
answer:
bonnie langford