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': 'Which among the following anaesthetic increases the cerebral oxygen consumption? \nSelect and explain. \nA. Alfentanil, B. Ketamine, C. Thiopentone, D. Propofol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ketamine increases cerebral oxygen consumption and it also increases intracranial tension.', 'role': 'assistant'}]