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

Which sprinter lit the Olympic flame at the 2000 Summer Olympic Games in Australia?
2000 summer olympics

'Arthur Clennam', 'Jeremiah Flintwinch', and 'Edward Sparkler' are all characters in which Dickens' novel?
arthur clennam

In which film does Michelle Pfeiffer play the character of Catwoman?

michelle pfeiffer