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:
Which model was married to photographer David Bailey for 10 years, from 1975?

Ex Output:
david bailey


Ex Input:
In the US, Oregon, Nevada and Arizona border which state?

Ex Output:

arizona