Problem:

You are presented with the quiz "Most people can survive only a few days without what?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "most people can survive only a few days without water" and "water is everywhere H20".   So, what's the best answer to the question?
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A: H20


Problem:

You are presented with the quiz "What phylum do starfish belong to?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "echinoderms have a unique water vascular system with tube feet" and "each starfish arm is lined with tube feet".   So, what's the best answer to the question?
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A: Echinoderm.


Problem:

You are presented with the quiz "What is important in the winter season?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "insulated material can be used for keeping warm" and "although it is important to keep warm during the winter season, it's also important to keep safe".   So, what's the best answer to the question?
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A: Insulated material


Problem:

You are presented with the quiz "What can sense pressure?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "touch is the ability to sense pressure" and "nerve damage that causes a reduction in the ability to feel touch or pain is very dangerous".   So, what's the best answer to the question?
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A: