This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'Which is an ominous sign in case of severe head injury? \nSelect and explain. \nA. Development of diabets insipidus, B. Anisocoria, C. New focal deficit, D. Depressed skull fracture', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Head Injury A sudden enlargement (dilatation) of one pupil (anisocoria) is an ominous sign Abnormal posturing (decoicate posturing) a characteristic positioning of the limbs caused by severe diffuse injury or high ICP is an ominous sign Ref: Harrison 19th edition Pgno: 1774', 'role': 'assistant'}]