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: Unknown
Cherry red colour postmortem appearance is seen in- 
Select and explain. 
A. Cyanide poisoning, B. Phosphorus, C. Arsenic, D. Mercury
A: Cyanide poisoning
Answer: A: Cyanide poisoning 
Explanation: (Cyanide poisoning) (8.40-P)Hydrocyanic acid (Cyanogen or prussic acid)*Externally - is the smell of bitter almonds from the body*Postmortem staining is pink often incorrectly referred to as cherry red***Rigor mortis sets in early if there have been convulsive seizures*Internally -*The smell of bitter almonds ***The mucous membrane of the stomach may be pink*Blood stained froth may be found in the trachea and bronchi*The brain and meninges are hyperaemic and petechial hemorrhages appear in the pleura and pericardium*Gastric mucous membrane which may be of a brick red to brown colour due to the formation of alkaline haematin.