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: Forensic Medicine
Hyperbaric oxygen is given in the treatment of: Bihar 12 
Select and explain. 
A. Nerve gas, B. CO2 poisoning, C. HCN poisoning, D. CO poisoning
D: CO poisoning
Answer: D: CO poisoning 
Explanation: Ans. CO poisoning