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
The earliest manifestation of increased intracranial pressure following head injury is 
Select and explain. 
A. Ipsilateral pupillary dilatation, B. Contralateral pupillary dilation, C. Altered mental status, D. Hemiparesis
C: Altered mental status
Answer: C: Altered mental status 
Explanation: • Early signs of elevated ICP includes drowsiness and a diminished level of consciousness.
• Coma and unilateral papillary changes are late signs and require immediate intervention.