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: Radiology
[{'content': 'The 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 newborns and infants with hydrocephalus, soon after birth an examination of the anterior fontanelle will reveal a widened fontanelle and sutural diastasis.', 'role': 'assistant'}]