Given a statement, generate a question such that the answer is contained in that statement.
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Question: A mineral made of carbon is used for making pencils.

Answer: What is a mineral made of?


Question: Premenopausal women have breasts

Answer: What do premenopausal women have?


Question: Algae play significant roles in freshwater and marine environments.

Answer:
Which species play significant roles in freshwater and marine environments?