This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 3, Subject name: Forensic Medicine
Danbury tremor is seen in? 
Select and explain. 
A. Mercury poisoning, B. Iron poisoning, C. Lead poisoning, D. Arsenic poisoning
A: Mercury poisoning
Answer: A: Mercury poisoning 
Explanation: Mercury poisoning :- Danbury tremor is a classical and consistent manifestation of mercury poisoning. Coarse intentional tremor interspersed with jerky movements. It begins in the hand and progresses to lips, tongue, arms and legs.