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

[Q]: Bones are made up of different types of tissue.
[A]: Bones are made up of different types of what?


[Q]: All life is built around the element carbon.
[A]: What element is all life built around?


[Q]: The different types of nuclei are referred to as nuclides.
[A]:
The different types of nuclei are referred to as what?