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': 'In rapid sequence intubation \nSelect and explain. \nA. Non-depolarizing muscle relaxants are used, B. Cricoid pressure of 30N is required, C. Opioids are contraindicated, D. Pre-oxygenation is not mandatory', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pre-oxygenation is mandatory in rapid sequence intubation. Succinylcholine, depolarizing muscle relaxant is the preferred agent. Short acting opioids can be administered prior to induction.', 'role': 'assistant'}]