TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: One gram of sugar or starch provides 4 calories of energy.

SOLUTION: How many calories of energy does one gram of sugar or starch provide?

PROBLEM: There are three quarks in each proton and neutron.

SOLUTION: How many quarks are in each proton and neutron?

PROBLEM: Leaves changing color on trees of these is the best sign that the fall season has begun.

SOLUTION:
Which of these is the BEST sign that the fall season has begun?