Given a statement and question, generate the answer to the question such that the answer is contained in the statement.
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Question: statement: pollution contains matter suspended in air, question: What is suspended in the air?

Answer: matter


Question: statement: Complex chemistry is needed to promote quality of life, question: What is needed to promote quality of life?

Answer: Complex chemistry


Question: statement: Butterflies have two pairs of wings for flight., question: What type of wings do Butterflies have?

Answer:
wings