Final answer:
Prolactin (PRL) is the hormone responsible for stimulating milk production in the breast through its actions on the mammary glands.
Explanation:
Prolactin (PRL) is the hormone that stimulates milk production in the breast. It is produced by the anterior pituitary gland and plays a crucial role in promoting lactation in women. Prolactin secretion is regulated by various hormones, including prolactin-releasing hormone (PRH) and prolactin-inhibiting hormone (PIH).
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