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 diameter of cervical canal after the complete dilation is : \nSelect and explain. \nA. 6 cms, B. 8 cms, C. 10 cms, D. 12 cms', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 10 cms', 'role': 'assistant'}]