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
[{'content': 'Danbury tremor is seen in? \nSelect and explain. \nA. Mercury poisoning, B. Iron poisoning, C. Lead poisoning, D. Arsenic poisoning', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]