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 following are the features of anovulatory menstruation except \nSelect and explain. \nA. The only symptom may be failure of conception., B. It is usually associated with painless periods., C. May be associated with DUB., D. May be associated with premenstrual syndrome.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Anovulatory DUB is characterised by irregular cycles, short cycles with scanty flow or periods of amenorrhoea followed by prolonged and irregular bleeding\xa0\nUsually due to alteration in the hypothalamic-pituitary axis.more common in extremes of reproductive life and in PCOS.\nunopposed oestrogen stimulation of the endometrium\nthis Oestrogen withdrawal bleeding is characteristically painless irregular and prolonged, lacking the synchronous nature of normal menstruation.', 'role': 'assistant'}]