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: Hemodialysis has a patient's blood pass through a length of tubing that travels through an artificial kidney machine.

Answer: Which form of dialysis has a patient's blood pass through a length of tubing that travels through an artificial kidney machine?

Question: Diffusion is the term for the movement of molecules from an area of high concentration to an area of low concentration.

Answer: What is the term for the movement of molecules from an area of high concentration to an area of low concentration?

Question: Along coasts are the oceans most polluted.

Answer:
Where are the oceans most polluted?