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

[EX Q]: statement: Vultures move their wings using muscles in the chest, question: What do Vultures move their wings using?
[EX A]: muscles in the chest

[EX Q]: statement: spiders lack wings, question: What type of spider lacks wings?
[EX A]: spiders

[EX Q]: statement: an optical system is used for observing stars by researchers, question: What is used for observing stars by researchers?
[EX A]:
an optical system