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

[EX Q]: Proteins are long chains of amino acids.
[EX A]: What are long chains of amino acids?

[EX Q]: Cloudy conditions will most likely result from a low-pressure weather system.
[EX A]: Which will most likely result from a low-pressure weather system?

[EX Q]: Co2 gas is released into the atmosphere when fossil fuels are burned.
[EX A]:
What gas is released into the atmosphere when fossil fuels are burned?