instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which is the only Avril Lavigne song to have reached No.1 in the US Billboard Chart?
answer:
avril lavigne


question:
The film Schindler's List was based on whose Booker Prize winning novel of 1982?
answer:
schindler's list


question:
African bush and African forest are species of which animal?
answer:

african bush elephant