This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
[{'content': 'A patient with rain drop pigmentation, which poisoning caused it - \nSelect and explain. \nA. Copper, B. Arsenic, C. Lead, D. Mercury', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e.. Arsenic o Chronic arsenic poisoning causes patchy brown raindrop type pigmentationCharacteristic features of some poisoningPoisonFeaturesAlcoholMe Evans sign, morbid jealousyCocaineMagnan symptom or formication, jet black tongue (cocaine bugs/ tactile hallucination), Acute MICannabisRun amok, amotivational syndromeAmphetamineParanoid hallucinatory' features (induced psychosis)LSDBad trips, flash backPhencyclidineDissociative anaesthesia", 'role': 'assistant'}]