Which hormone causes the mammary glands to produce milk?

• A. Prolactin
• B. Oxytocin
• C. Progesterone
• D. Estrogen

Answer: (A)

Verified step by step guidance

1. Understand the role of each hormone listed in the options: Prolactin, Oxytocin, Progesterone, and Estrogen.
2. Prolactin is primarily responsible for stimulating milk production in the mammary glands. It is secreted by the anterior pituitary gland.
3. Oxytocin is involved in the milk ejection reflex, also known as the 'let-down' reflex, but does not directly stimulate milk production.
4. Progesterone and Estrogen are involved in the development of the mammary glands during pregnancy but do not directly cause milk production.
5. Identify that Prolactin is the hormone that directly causes the mammary glands to produce milk.