This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Mercury poisoning is characterized by all Except \nSelect and explain. \nA. Tremor, B. KF ring, C. PCT necrosis, D. Salivation', 'role': 'user'}, {'content': "Answer: B \nExplanation: Kayser-Fleischer ring A golden brown or green ring is seen in the peripheral descement's membrane is a diagnostic feature of Wilson's disease. This will also be seen in chronic exposure to copper. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 430", 'role': 'assistant'}]