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': 'All are stages of anaesthesia except – \nSelect and explain. \nA. Analgesia, B. Allodynia, C. Delirium, D. Surgical anesthesia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Stages of anaesthesia are :- Stage of analgesia (stage 1), stage of delirium or excitement (stage 2), stage of surgical\xa0anesthesia (stage 3) and stage of medullary paralysis (stage 4).', 'role': 'assistant'}]