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': 'Hormone for breast milk feeding is: \nSelect and explain. \nA. Oxytocin, B. Prolactin, C. Galactogen, D. GH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oxytocin', 'role': 'assistant'}]