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': 'Hydrocephalus in the fetus is diagnosed by all except : \nSelect and explain. \nA. Large fontanelle with widely separated sutures as felt on PV examination, B. High floating head, C. Serial ultrasound, D. CPD', 'role': 'user'}, {'content': 'Answer: D \nExplanation: CPD', 'role': 'assistant'}]