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': 'Irregular shedding of the endometrium occurs due to : \nSelect and explain. \nA. Epithelium being immature, B. It does not show the deciduas-like oedema of the secretory phase, C. Regression of the corpus luteum function, D. Over activity of the corpus luteum function', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Over activity of the corpus luteum function', 'role': 'assistant'}]