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': 'Average rate of cervical dilation is : \nSelect and explain. \nA. 1 cm/hour, B. 2 cm/hour, C. 3 cm/hour, D. 4 cm/hour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 1 cm/hour', 'role': 'assistant'}]