This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
[{'content': 'A FACTORY WORKER PRESENTED WITH TREMORS AND PERSONALITY CHANGES ON EXAMINATION HIS HANDS SHOWN BELWO , WHAT IS THE DIAGNOSIS? \nSelect and explain. \nA. MERCURY POISONING, B. LEAD POISONING, C. ARSENIC POISONING, D. COCAINE POISONING', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mercury Poisoning Acute effect * By ingestion: local corrosive effects; nausea, vomiting, severe abdominal pain, chemical colitis, renal damage * By inhalation: chemical pneumonitis, pulmonary edema Chronic effect * Classic symptoms: tremor, gingivitis, erethism (greek erethismos = irritate) * Renal & CNS damage * Minamata disease - neurological syndrome caused by severe mercury poisoning REF : NARAYANA REDDY TOXICOLOGY', 'role': 'assistant'}]