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
Bright red color on postmortem staining found in - 
Select and explain. 
A. CO, B. HCN, C. H2S, D. P
B: HCN
Answer: B: HCN 
Explanation: In cyanide (HCN) poisoning, postmortem staining is pink or bright red.