The hormone primarily responsible for the milk ejection is?

Correct option is C

Sol. Oxytocin is responsible for the milk ejection reflex or "let-down" during breastfeeding. When a baby suckles, oxytocin is released from the posterior pituitary, causing contraction of myoepithelial cells around the alveoli in the breast, pushing milk into ducts.
Explanation of each option:
· (a) Oestrogen – Prepares breast tissue during pregnancy but does not stimulate milk ejection.
· (b) Progesterone – Maintains pregnancy and inhibits milk production until delivery.
· (c) Oxytocin – Correct. It causes milk to be expelled from the breast during feeding.
· (d) Prolactin – Responsible for milk production, not its ejection from the breast.