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
In rapid sequence intubation 
Select and explain. 
A. Non-depolarizing muscle relaxants are used, B. Cricoid pressure of 30N is required, C. Opioids are contraindicated, D. Pre-oxygenation is not mandatory
B: Cricoid pressure of 30N is required
Answer: B: Cricoid pressure of 30N is required 
Explanation: 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.