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
First sign of hydrocephalus in children is: 
Select and explain. 
A. Post clinoid erosion, B. Large head, C. Sutural diastasis, D. Thinned out vault
C: Sutural diastasis
Answer: C: Sutural diastasis 
Explanation: 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