Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: A diet rich in calcium and vitamin d may reduce the risk of osteoporosis and related bone fractures.

Answer: A diet rich in calcium and what vitamin may reduce the risk of osteoporosis and related bone fractures?


Question: The female reproductive system consists of structures that produce eggs, secrete female sex hormones, and ultimately enable birth of a fetus.

Answer: What system consists of structures that produce eggs, secrete female sex hormones, and ultimately enable birth of a fetus?


Question: Catecholamines are a class of amine hormones that when synthesised form the amino acid tyrosine.

Answer:
Catecholamines are a class of amine hormones synthesised form which amino acid?