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

Input: Consider Input: Most protein antigens require signals from helper t cells (th2) to proceed to make antibody.

Output: Most protein antigens require signals from helper t cells (th2) to proceed to make what?

Input: Consider Input: Seismic waves prove the inner core it is solid.

Output: What do seismic waves prove about the inner core?

Input: Consider Input: High levels of radiation can remove electrons from?
Output: High levels of radiation can remove electrons from?