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: Anaesthesia
[{'content': 'Thiopentone has cerbroprotective effect because of – \nSelect and explain. \nA. Decrease cerebral metabolism, B. Reduction of vasospasm, C. Calcium channel blockage, D. Free redical removal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Thiopentone may be used as a cerebroprotective agent as it consistently reduces the cerebral metabolic rate (cerebral oxygen consumption).', 'role': 'assistant'}]