This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of menstruation, Subject name: Gynaecology & Obstetrics
[{'content': 'Halba disease is ________ \nSelect and explain. \nA. Irregular shedding due to persistent corpus leuteum, B. Menstruation is irregular, C. Irregular ripening, D. Due to adenomatous polyp', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Halbans disease is irregular shedding due to persistent corpus luteum. It is rare and usually self-limiting Menstruation occurs on time and is prolonged but not heavy.. Ref: Shaw&;s textbook of Gynaecology 17th edition pgno: 139', 'role': 'assistant'}]