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 is detailed best antenatally by – \nSelect and explain. \nA. X-ray abdomen, B. Amniocentesis, C. Clinical examination, D. Ultrasonography', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The best method for diagnosis of hydrocephalus prenatally is ultrasound.\nOn ultrasound, the excess uid is rejected by ventriculomegaly', 'role': 'assistant'}]