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': 'O2 delivery is regulated by WE \nSelect and explain. \nA. O2 tent, B. Venti mask, C. Poly mask, D. Noval Catheter', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]