instruction:
Given a statement, generate a question such that the answer is contained in that statement.
question:
Small-sized viviparous mammals evolved by Jurassic times.
answer:
When did small-sized viviparous mammals evolve?


question:
salpingitis can inhibit mating.
answer:
What can inhibit mating?


question:
the brain receives impulses
answer:

What does the brain receive?