Which of the Following is Least True of Prolactin

Question

Which of the following is least true of prolactin?
A) Secreted by the anterior pituitary gland
B) Stimulates the mammary gland
C) Is an adenohypophyseal hormone
D) Plays the primary role in the milk let-down reflex

Accepted Answer

While prolactin is involved in milk production and is secreted by the anterior pituitary gland as an adenohypophyseal hormone, it is not the primary hormone involved in the milk let-down reflex. This is primarily controlled by oxytocin.