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': 'Which is an ominous sign in case of severe head injury \nSelect and explain. \nA. Development of diabetes 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's 19th edition Pgno :1774", 'role': 'assistant'}]