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
The poison that can be detected in hair long after death is - 
Select and explain. 
A. Lead, B. Mercury, C. Arsenic, D. Cannabis
C: Arsenic
Answer: C: Arsenic 
Explanation: Arsenic poisoning can be detected from hair and nails long after death.