Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
Example: Earth rotates on its axis once times in one day.
Example solution: How many times does Earth rotate on its axis in one day?
Example explanation: The given output correctly poses a question based on the scientific fact given.

Problem: The main function of the spleen is to filter the blood and remove unwanted red blood cells.
Solution: The main function of this organ is to filter the blood and remove unwanted red blood cells?