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
Marquis test is done for: BHU 08 
Select and explain. 
A. Mercury poisoning, B. Arsenic poisoning, C. Morphine poisoning, D. Cyanide poisoning
C: Morphine poisoning
Answer: C: Morphine poisoning 
Explanation: Ans. Morphine poisoning