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

[Q]: Which SF author wrote The Day it Rained Forever?
[A]: the day it rained forever


[Q]: Which 1970s musical film starred Angela Lansbury as a trainee witch?
[A]: angela lansbury


[Q]: Antonia Robinson and Anna Valentine, London designers who work under the name Robinson Valentine, designed a cream-coloured dress and coat worn by whom at her wedding to Prince Charles on 9 April 2005?
[A]:
charles