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

[Q]: Soft of these best describes the way a feather feels.
[A]: Which of these BEST describes the way a feather feels?


[Q]: Atoms of metals are good conductors of electricity because they give up electrons.
[A]: Why are atoms of metals good conductors of electricity?


[Q]: Chemistry is based on the modern atomic theory, which states that all matter is composed of atoms.
[A]:
What branch of science is based on the modern atomic theory, which states that all matter is composed of atoms?