instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Superior sagittal sinus is the largest of the sinuses.
answer:
What is the largest of the sinuses?


question:
Socket secures teeth in the mouth.
answer:
What secures teeth in the mouth?


question:
Amines are classified according to the number of carbon atoms bonded directly to a(n) nitrogen atom.
answer:
Amines are classified according to the number of carbon atoms bonded directly to what atom?