A. Prolactin
A.
B. Oxytocin
B.
C. Estrogen
C.
D. Progesterone
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
Oxytocin is the hormone that triggers the contraction of muscles in the mammary glands, allowing milk to be "let down" from the breast when a baby suckles.