instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Protons and neutrons are made of quarks, which are fundamental particles of matter.
answer:
A fundamental particle of matter, protons and neutrons are made of these?


question:
A covalent network solid is a compound in which all of the atoms are connected to one another by covalent bonds.
answer:
What is a compound in which all of the atoms are connected to one another by covalent bonds?


question:
Star, solar system, galaxy, universe of the following correctly lists the structures in space from smallest to largest.
answer:
Which of the following correctly lists the structures in space from smallest to largest?