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: Anatomy
[{'content': 'Length of Female adult cervical canal is - \nSelect and explain. \nA. 2 cms, B. 2.5 cms, C. 6 cms, D. 10 cms', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]