TASK DEFINITION: Given a statement and question, generate the answer to the question such that the answer is contained in the statement.
PROBLEM: statement: Bats use muscles in the chest to fly, question: What do bats use to fly?

SOLUTION: muscles in the chest

PROBLEM: statement: In the puberty stage is a time of significant mental, emotional and social modification., question: What stage is a time of significant mental, emotional and social modification?

SOLUTION: puberty

PROBLEM: statement: Water must not be polluted to be safe., question: What must not be polluted to be safe?

SOLUTION:
Water