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

[EX Q]: You call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission, superconductors.
[EX A]: What do you call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission?

[EX Q]: Resistors connected end to end are said to be in series.
[EX A]: Resistors connected end to end are said to be in what?

[EX Q]: The cytoskeleton is the skeleton of the cell.
[EX A]:
What is the skeleton of the cell?