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

[EX Q]: Limestone is insoluble in water, so acid can dissolve it.
[EX A]: Limestone is insoluble in water, so what can dissolve it?

[EX Q]: The nuclear envelope is a double-layered plasma membrane like the cell membrane, although without membrane proteins.
[EX A]: The nuclear envelope is a double-layered plasma membrane like the cell membrane, although without what?

[EX Q]: Phenol was the first antiseptic called.
[EX A]:
What was the first antiseptic called?