instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Physics. What is the SI unit for amount of substance?
answer:
amount of substance


question:
The Bob Dylan songs 'Desolation Row', 'Tombstone Blues' and 'Like A Rolling Stone' featured on which album?
answer:
tombstone blues


question:
Who has managed the football teams West Bromich Albion, Manchester United, Atletico Madrid, Sheffield Wednesday, Aston Villa and Coventry?
answer:

aston villa f.c.