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': 'Average age range of attaining menopause is : \nSelect and explain. \nA. 40 - 50, B. 45 - 55, C. 55 - 60, D. 58 - 68', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 45 - 55', 'role': 'assistant'}]