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: Gynaecology & Obstetrics
[{'content': 'The hormone responsible for lactation is : \nSelect and explain. \nA. Prolactin, B. FSH, C. LH, D. Progesterone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Prolactin', 'role': 'assistant'}]