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': "In Browne's classification of placenta pre, the placenta covers the internal os when closed but not when fully dilated is: \nSelect and explain. \nA. Type 1, B. Type 2, C. Type 3, D. Type 4", 'role': 'user'}, {'content': "Answer: C \nExplanation: Browne's classification for placenta pre: Type 1 lateral Placenta dipping into the lower segment but reached upto the os Type 2 marginal Placenta edge reached the internal os Type 3 The placenta covers the internal os when closed but not when fully dilated Type 4 The placenta covers the internal os even fully dilated", 'role': 'assistant'}]