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
True regarding Nitrous oxide is: March 2013 (d) 
Select and explain. 
A. Stored at room temperature, B. Blunts ventilatory response to hypoxia, C. Highly inflammable, D. Complete anaesthetic agent
B: Blunts ventilatory response to hypoxia
Answer: B: Blunts ventilatory response to hypoxia 
Explanation: Ans. B i.e. Blunts ventilator response to hypoxia Nitrous oxide Discovered by: Priestly Cylinder colour: Blue PIN index (code): 3,5 Also known as: Laughing gas, Adverse effects: - Megaloblastic anemia, - Bone marrow suppression, Second gas effect/ diffusion hypoxia C/I in: - Pneumothorax, - Air embolism etc.