This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
In case of burning fire in a closed room, death occurs due to: 
Select and explain. 
A. CO2 poisoning, B. CO poisoning, C. Cardiac fauilre, D. Respiratory failure
B: CO poisoning
Answer: B: CO poisoning 
Explanation: Ans. (b) CO poisoningRef: The essentials of FSM by KS Narayan Reddy 31st ed./582