This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuromuscular Blocker, Subject name: Anaesthesia
All statement is true about modified rapid sequence induction- except- 
Select and explain. 
A. Rocuronium is used as neuromuscular blocker, B. Any IV induction agent can be used, C. Positive pressure ventilation with Bag + Mask is not done, D. Preoxygenation is not mandatory
D: Preoxygenation is not mandatory
Answer: D: Preoxygenation is not mandatory 
Explanation: Any changes from classical RSI steps is called modified RSI. Today we practice lot of modifications. Instead of thiopentone we can use some other intravenous anesthetic depending upon requirement. We can use instead of succinylcholine rocuronium . Positive pressure ventilation with Bag + Mask is not done Preoxygenation is mandatory even in modified RSI.