This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': 'The earliest manifestation of increase intracranial pressure following head injury is \nSelect and explain. \nA. Hemiparesis, B. Altered mental status, C. Ipsilateral pupillary dilatation, D. Contralateral pupillary dilatation', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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 Ref : Harrison's 19th edition Pgno :1779", 'role': 'assistant'}]