This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
Nasal swabs preserved in - 
Select and explain. 
A. Drowning, B. Anaphylaxis, C. Cocaine poisoning, D. None
C: Cocaine poisoning
Answer: C: Cocaine poisoning 
Explanation: Ans- C. Ref- Textbook of Forensic Medicine and Toxicology, Fifth Edition - Krishan Vij Explanation - Cocaine can be recovered by sampling from recent injection sites, or by swabs from the nasal mucosa. Brain is an excellent source for its detection where cocaine may be found not only in dopamine-rich areas such as caudate, putamen, and nucleus accumbens, but also in other extrastriatal regions.