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

[Q]: A(n) an ionic bond forms when the metal sodium gives up an electron to the nonmetal chlorine.
[A]: What forms when the metal sodium gives up an electron to the nonmetal chlorine?


[Q]: An object attached to a spring sliding on a frictionless surface is an uncomplicated type of simple harmonic oscillator.
[A]: An object attached to a spring sliding on a frictionless surface is an uncomplicated type of what device?


[Q]: The largest known proteins are called titins.
[A]:
What are the largest known proteins called?