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
Cherry red color in postmoem staining is a feature of poisoning with: WB 08; NEET 13 
Select and explain. 
A. Nitrites, B. Aniline, C. Phosphorus, D. CO
D: CO
Answer: D: CO 
Explanation: Ans. CO