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
Buonian line is seen in chronic poisoning of: March 2004 
Select and explain. 
A. Arsenic, B. Lead, C. Copper, D. Mercury
B: Lead
Answer: B: Lead 
Explanation: Ans. B i.e. Lead