This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast Milk & Breast Feeding, Subject name: Pediatrics
[{'content': "Which hormone is involved in 'milk secretion reflex'? \nSelect and explain. \nA. Oxytocin, B. Prolactin, C. Vasopressin, D. Progesterone", 'role': 'user'}, {'content': "Answer: B \nExplanation: In 'milk secretion reflex',- when the baby sucks, nerve endings in nipple carry impulse to anterior pituitary - release of Prolactin - Alveolar glands of breast stimulated to secrete milk. Oxytocin- Milk ejection reflex", 'role': 'assistant'}]