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': 'Which of the following surgical therapies is least effective in treatment of myoma associated with heavy menstrual bleeding \nSelect and explain. \nA. Myomectomy, B. Hysteroscopic resection, C. Endometrial ablation, D. Hysterectomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Endometrial ablation technique has high failure rate.', 'role': 'assistant'}]