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
A factory worker presented with tremors, personality change and a blue line in gums. Probable diagnosis is chronic poisoning with: Al 10 
Select and explain. 
A. Lead, B. Mercury, C. Arsenic, D. Thallium
B: Mercury
Answer: B: Mercury 
Explanation: Ans. Mercury