Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Mercury is the name of the smallest planet in our solar system, which is also nearest to the sun.

Answer: What is the name of the smallest planet in our solar system, which is also nearest to the sun?

Question: A frog develops (a/an) lungs as it changes from a tadpole to an adult frog.

Answer: Which of the following structures does a frog develop as it changes from a tadpole to an adult frog?

Question: Phenol was the first antiseptic called.

Answer:
What was the first antiseptic called?