instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
'Highway 61 Revisited' and 'Blood On The Tracks' were both albums released by which popular singer?
answer:
highway 61 revisited


question:
Which cyclist won the first medal for Team GB at the 2012 Olympic Games?
answer:
gb


question:
In the human body what is a carotid?
answer:

common carotid artery