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: Medicine
[{'content': 'The earliest manifestations of increased intracranial pressure following head injury is : \nSelect and explain. \nA. Ipsilateral papillary dilatation, B. Contralateral papillary dilatation, C. Altered mental status, D. Hemiparesis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Answer is C (Altered mental status) : `Early signs of elevated ICP include drowsiness and a diminished level of consciousness (altered mental status). Coma and unilateral papillary changes are late signs and require immediate intervention.' -Harrisons", 'role': 'assistant'}]