This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Physiology & Histology, Subject name: Gynaecology & Obstetrics
[{'content': 'The presentation of Asherman syndrome typically involves \nSelect and explain. \nA. Hypomenorrhea, B. Oligomenorrhea, C. Menorrhagia, D. Metrorrhagia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ovulation is not affected in Asherman syndrome. Because of the decreased amount of functional endometrium, progressive hypomenorrhea (lighter menstrual flow) or amenorrhea is common. The best diagnostic study is the hysterosalpingogram under fluoroscopy. Hysteroscopy with lysis of adhesions is the treatment of choice. Prophylactic antibiotics may improve success rates.', 'role': 'assistant'}]