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

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

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


Ex Input:
Restoration ecologists type of ecologists work to identify and manipulate the processes that most limit recovery of ecosystems from disturbances.

Ex Output:
What type of ecologists work to identify and manipulate the processes that most limit recovery of ecosystems from disturbances?


Ex Input:
Symmetry in forces law states whenever one body exerts a force on a second body, the first body experiences a force that is equal in magnitude and opposite in direction to the force that the first body exerts.

Ex Output:

What law states whenever one body exerts a force on a second body, the first body experiences a force that is equal in magnitude and opposite in direction to the force that the first body exerts?