instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Just as salty taste involves perception of sodium ions in saliva, sweet taste correlates with presence of glucose.
answer:
Just as salty taste involves perception of sodium ions in saliva, what taste correlates with presence of glucose?

question:
There are three quarks in each proton and neutron.
answer:
How many quarks are in each proton and neutron?

question:
Most digestion is completed in the duodenum.
answer:
Where is most digestion completed?