Which hormone stimulates mammary glands to produce milk in nursing mothers?

Prolactin.

Explanation:

it is a lactogenic hornone that is produced in the anterior lobe of the pituitary gland. it serum levels increases with pregnancy where it increases the sizes of  mammary glands.

its control of milk production is regulated by progesterone during pregnancy. However ,as the  levels of progesterone drops, and suckling reflex  commences,   after birth, its lactogenic activities increases.

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answer; (c); /out to the side and directly under the dogs neck.