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

[Q]: Bacteria is usually the prey of a protist.
[A]: What is usually the prey of a protist?


[Q]: Most protein antigens require signals from helper t cells (th2) to proceed to make antibody.
[A]: Most protein antigens require signals from helper t cells (th2) to proceed to make what?


[Q]: Dig a well allows people to access water in an aquifer that does not flow from a spring or a geyser.
[A]:
How can people access water in an aquifer that does not flow from a spring or a geyser?