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 graph showing relationship between cervical dilatation and duration of labour is : \nSelect and explain. \nA. Paogram, B. Cervicograph, C. Growth curve, D. Dilatation cha', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cervicograph', 'role': 'assistant'}]