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': 'Which of the following inhibit GnRH pulse secretion \nSelect and explain. \nA. Insulin, B. Prolactin, C. Thyroxine, D. Oxytocin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Prolactin inhibits GnRH pulse secretion. Thus Hyperprolactinemia inhibits ovarian steroidogenesis.', 'role': 'assistant'}]