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

Physics. What is the SI unit for amount of substance?
amount of substance

What famous novel invented the terms thoughtcrime and doubleplusgood?
newspeak

Bob Hoskins, an English actor awarded and acclaimed for roles in TV and film ranging from gangsters to playing opposite a cartoon, died in April 2014 at 71; he also, at the age of over 60, played something very close to a romantic interest in which film?

bob hoskins