TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Lipids are available to the body from three sources.

SOLUTION: Lipids are available to the body from how many sources?

PROBLEM: Yeast fermentation causes holes in bread.

SOLUTION: What causes holes in bread?

PROBLEM: Physiological type of response do signal transductions within target cells bring about.

SOLUTION:
What type of response do signal transductions within target cells bring about?