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: Deep currents are caused by differences in density at the top and bottom of the ocean.

Answer: What is caused by differences in density at the top and bottom of the ocean?

Question: When the smooth muscle relaxes, the arterioles dilate, allowing blood to enter the capillaries.

Answer: When the smooth muscle relaxes, the arterioles dilate, allowing blood to enter the what?

Question: If a unit is named after a person it needs to be capitalized.

Answer:
If a unit is named after a person it needs to be?