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: Complex chemistry is needed to carry out cell division and reproduction, question: What is needed to carry out cell division and reproduction?

Answer: Complex chemistry


Question: statement: Stimulus is converted to electrical signals., question: Stimulus is converted to what?

Answer: electrical signals


Question: statement: Acid changes the shade of certain paper at different acidity., question: What does acid change the shade of paper at?

Answer:
acid