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 increases GnRH pulsatility \nSelect and explain. \nA. Oestrogen, B. Progesterone, C. Androgens, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oestrogen increases GnRH pulse frequency.', 'role': 'assistant'}]