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/bones long after death is: Gujarat 07; COMEDK 08; FMGE 08 
Select and explain. 
A. Lead, B. Mercury, C. Arsenic, D. Cannabis
C: Arsenic
Answer: C: Arsenic 
Explanation: Ans. Arsenic