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

[Q]: The discovery of ribozymes nullified the idea that all biological catalysts are proteins.
[A]: What nullified the idea that all biological catalysts are proteins?


[Q]: A frog develops (a/an) lungs as it changes from a tadpole to an adult frog.
[A]: Which of the following structures does a frog develop as it changes from a tadpole to an adult frog?


[Q]: Diffraction is the phenomenon in which light and sound waves become circular at the point source of a barrier.
[A]:
What is the phenomenon in which light and sound waves become circular at the point source of a barrier?