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

[Q]: Protist diseases in humans are caused by protozoa.
[A]: What type of diseases in humans are caused by protozoa?

[Q]: Lying with their mouths open, a behavior called gaping, probably serves the function of cooling down for crocodiles.
[A]: Lying with their mouths open, a behavior called gaping, probably serves what function for crocodiles?

[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?