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
Burtonian line is seen in? 
Select and explain. 
A. Mercury, B. Lead, C. Arsenic, D. Zinc
B: Lead
Answer: B: Lead 
Explanation: Ans. is 'b' i.e., Lead o Burtonian line is blue line, which is seen on upper gums in lead poisoning.o Similar blue line (but not called burtonian line in these cases) is also seen in poisoning with Mercury (Hg), Copper (Cu)y Silver (Ag), bismuth (Bi), andiron (Fe).