Given a statement, generate a question such that the answer is contained in that statement.

[EX Q]: H2O is needed for all life on the planet.
[EX A]: What is needed for all life on the planet?

[EX Q]: HIV is not affected by drugs
[EX A]: HIV is not affected by what?

[EX Q]: a slide rule is used for subtracting
[EX A]:
What rule is used for subtracting?