This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
Diffusion hypoxia is seen with which drug: 
Select and explain. 
A. Nitrous oxide, B. Ketamine, C. Theophylline, D. Halothane
A: Nitrous oxide
Answer: A: Nitrous oxide 
Explanation: Ans. A. Nitrous oxideDiffusion hypoxia is side effect seen with nitrous oxide. It is seen when suddenly N2 O is stopped while recovering from anaesthesia. It can be prevented by supplying 100 percent O2 to the patient.