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': 'Maturation index during pregnancy: \nSelect and explain. \nA. 0, 40, 50, B. 50, 40, 0, C. 0, 0, 100, D. 0, 95, 5', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]