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': 'The length of the female urethra is : \nSelect and explain. \nA. 20 mm, B. 40 mm, C. 45 mm, D. 60 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 40 mm', 'role': 'assistant'}]