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
O2 delivery is regulated by WE 
Select and explain. 
A. O2 tent, B. Venti mask, C. Poly mask, D. Noval Catheter
D: Noval Catheter
Answer: D: Noval Catheter 
Explanation: D i.e. Noval Catheter - Nasal catheter is used for 02 delivery not novel catheter. O2 is delivered through various devices. The common used methods are.