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
The brick red colour of postmortem lividity is deen in poisoning due to 
Select and explain. 
A. Carbonmonoxide, B. Hydrogen sulfide, C. Phosphorous, D. Cyanide
D: Cyanide
Answer: D: Cyanide 
Explanation: None