This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2019, Subject name: Anaesthesia
Which is not an obvious advantage of high pressure oxygen through cannula: 
Select and explain. 
A. Bypassing nasopharyngeal dead space, B. Decreases need for intubation, C. PEEP, D. Hot and Humidification of air
A: Bypassing nasopharyngeal dead space
Answer: A: Bypassing nasopharyngeal dead space 
Explanation: High pressure oxygen through cannula: Oxygen supply system capable of delivering up to 100% humidified and heated oxygen at a flowrate of up to 60 liters per minute. This device increases the FiO2 (21-100%) and reduces the need for intubation. It also creates some amount of PEEP: 3-5mmhg