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': 'Commonest side effect of cryotherapy for carcinoma cervix in situ : \nSelect and explain. \nA. Hemorrhage, B. Persistent watery discharge, C. Cervical stenosis, D. Ulceration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Persistent watery discharge', 'role': 'assistant'}]