Given a statement and question, generate the answer to the question such that the answer is contained in the statement.

[EX Q]: statement: Frogs croak to alert other frogs that is their territory, question: Frogs croak to do what to other frogs?
[EX A]: alert other frogs

[EX Q]: statement: respiration is essential, question: What is essential?
[EX A]: respiration

[EX Q]: statement: Incinerators generate pollution, question: What generates pollution?
[EX A]:
Incinerators