instruction:
Given a statement and question, generate the answer to the question such that the answer is contained in the statement.
question:
statement: bone density decreases when osteoclasts are more active than osteoblasts, question: What is more active than osteoblasts?
answer:
osteoclasts


question:
statement: Flu is not affected by penicillin, question: Flu is not affected by what?
answer:
penicillin


question:
statement: teenagers experience significant mental, emotional, and social changes, question: What type of changes do teenagers experience?
answer:

mental, emotional, and social