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: Pathology
[{'content': 'Squamocolumanr junction is usually located....from cervical lip - \nSelect and explain. \nA. 2.5 mm, B. 8-13mm, C. 20-30mm, D. 40-50mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]