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': 'Antimullerian hormone levels, during menopausal transition \nSelect and explain. \nA. Remain constatn, B. Decrease, C. Increase, D. Varies', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Anti mullerian hormone levels decrease markedly and progressively across menopausal transition.', 'role': 'assistant'}]