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
Postmortem nasal swab in death following - 
Select and explain. 
A. Cocaine poisoning, B. Hanging, C. Drowning, D. Strychnine poisoning
A: Cocaine poisoning
Answer: A: Cocaine poisoning 
Explanation: Postmortem nasal swab is taken in poisoning with cocaine because cocaine is usually sniffed for its effects for addiction purposes. Long-term use of cocaine of sniffing causes ulceration and necrosis of the nasal septum.