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

Ex Input:
Which American actor and singer has joined Amanda Holden as one of the judges on the current series of 'Britain's Got Talent'?

Ex Output:
britain's got talent


Ex Input:
In which city could you visit the Anne Frank House?

Ex Output:
anne frank house


Ex Input:
The bacteria used in botox is also responsible for what disease?

Ex Output:

botulinum toxin