This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Menstruation, Abnormal Menstruation, Menopausal Physiology and forsight of conception, Subject name: Gynaecology & Obstetrics
[{'content': "Halban's disease is due to \nSelect and explain. \nA. Persistent corpus luteum, B. Deficient corpus luteum, C. Persistent trophoblast, D. Deficient trophoblast", 'role': 'user'}, {'content': "Answer: A \nExplanation: Halban's disease: Rare, self-limiting process. Also called Irregular shedding endometrium Due to persistent corpus luteum due to incomplete withdrawal of LH even on 26 in day of cycle. The corpus luteum continues to secret progesterones Menstruation comes on time, is prolonged but not heavy. Slight bleeding continues intermittently for several days after proper flow. On D& C done on 5-6th of cycle - endometrial tissue shows presence of proliferative endometrium along with secretory endometrium", 'role': 'assistant'}]