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

[EX Q]: 10 million years long can a large star be on the main sequence stage.
[EX A]: How long can a large star be on the main sequence stage?

[EX Q]: Water leaves ponds and lakes through evaporation and also as outflow.
[EX A]: Water leaves ponds and lakes through evaporation and also as what?

[EX Q]: Menopause occurs in in middle adulthood.
[EX A]:
At what time of life does menopause occur?