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
Deep blue colour of hypostasis is seen in death due to poisoning by : 
Select and explain. 
A. Potassium cyanide, B. Phosphorus, C. Aniline dyes, D. Carbon monoxide
C: Aniline dyes
Answer: C: Aniline dyes 
Explanation: C i.e. Aniline dye