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
True about milk secretion: 
Select and explain. 
A. Neuroendocrine pa of post pituitary is involved, B. Secretion by contraction of lactiferous sinus, C. Oxytocin hormone is involved, D. All
D: All
Answer: D: All 
Explanation: A, B, C i.e. Neuroendocrine pa of post pituitary is involved, Secretion by contraction of lactiferous sinus, Oxytocin hormone is involved