Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Endoscopes are used to explore the body through various orifices or minor incisions.

Answer: Endoscopes are used to explore the body through various orifices or these?


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

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


Question: The properties of the alkali metals are similar to each other as expected for elements in the same family.

Answer:
The properties of the alkali metals are similar to each other as expected for elements in the same what?