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

Input: Consider Input: 'Highway 61 Revisited' and 'Blood On The Tracks' were both albums released by which popular singer?

Output: highway 61 revisited

Input: Consider Input: Who plays Isobel Crawley in the UK television series 'Downton Abbey'?

Output: downton abbey

Input: Consider Input: In which US state will you find Arlington, the national cemetery?
Output: arlington