Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ex Input:
It takes about one year for earth to orbit the sun.

Ex Output:
Which of these takes about one year to complete?

Ex Input:
Control rods play an important role in the modulation of the nuclear chain reaction.

Ex Output:
What play an important role in the modulation of the nuclear chain reaction?

Ex Input:
Starches are complex carbohydrates that are the polymers of glucose.

Ex Output:
What complex carbohydrates are the polymers of glucose?