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 fallopian tube is : \nSelect and explain. \nA. 8-10 cm, B. 10 - 12 cm, C. 15 - 18 cm, D. 18 - 20 cm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 10 - 12 cm', 'role': 'assistant'}]