[Q]: The mirror in the bathroom fogged up.

effect:
[A]: The girl turned on the fan.
[Q]: The man held his breath.

cause:
[A]: He went underwater.
[Q]: The librarian located the book in the stacks.

cause:
[A]: I requested the librarian's help.
[Q]: The boy had trouble buttoning his shirt.

effect:
[A]:
He asked his mother for help.