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

[Q]: Six many neutrons do 99% of carbon atoms have.
[A]: How many neutrons do 99% of carbon atoms have?


[Q]: Just as salty taste involves perception of sodium ions in saliva, sweet taste correlates with presence of glucose.
[A]: Just as salty taste involves perception of sodium ions in saliva, what taste correlates with presence of glucose?


[Q]: Triad is the arrangement of a t-tubule with the membranes of sr on either side called.
[A]:
What is the arrangement of a t-tubule with the membranes of sr on either side called?