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

[Q]: The long bone work as lever.
[A]: What type of function does the long bone perform?


[Q]: Water can be boiled to kill giardia and most other pathogens.
[A]: Water can be boiled to kill giardia and most other what?


[Q]: When naming an ionic compound, the cation is written first.
[A]:
What part is written first when naming an ionic compound?