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
Buon's line is seen in: Al 07; Rajasthan 11; NEET 13; JIPMER 13 
Select and explain. 
A. Lead poisoning, B. Arsenic poisoning, C. Phosphorus poisoning, D. Zinc poisoning
A: Lead poisoning
Answer: A: Lead poisoning 
Explanation: Ans. Lead poisoning