This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'True about milk secretion: \nSelect and explain. \nA. Neuroendocrine pa of post pituitary is involved, B. Secretion by contraction of lactiferous sinus, C. Oxytocin hormone is involved, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A, B, C i.e. Neuroendocrine pa of post pituitary is involved, Secretion by contraction of lactiferous sinus, Oxytocin hormone is involved', 'role': 'assistant'}]