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: Surgery
[{'content': 'First sign of hydrocephalus in children is: \nSelect and explain. \nA. Post clinoid erosion, B. Large head, C. Sutural diastasis, D. Thinned out vault', 'role': 'user'}, {'content': "Answer: C \nExplanation: In infants the diagnosis of hydrocephalus is confirmed by USG (as the fontanel are open) and in most cases it tells about the level of obstruction & cause (like dandy walker & arachnoid cyst.) Investigation of Choice for Hydrocephalus Infant's older patients low pressure(Hydrocephalus Elderly) Ultrasonography CT / MRI MRI", 'role': 'assistant'}]