This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
[{'content': 'Mercury poisoning is characterized by all EXCEPT: \nSelect and explain. \nA. Tremor, B. K F ring, C. Anterior lens capsule deposits, D. pink disease', 'role': 'user'}, {'content': "Answer: B \nExplanation: Kayser-Fleischer Ring: Seen in Copper poisoning Sign: Brownish-yellow ring visible around the corneo-scleral junction(limbus). Cause: Deposition of copper in Descemet's membrane, extending into the trabecular meshwork. First appears at the superior pole, then develops inferiorly and ultimately becomes circumferential. Detected by slit lamp examination in early stages.", 'role': 'assistant'}]