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
A patient with rain drop pigmentation, which poisoning caused it - 
Select and explain. 
A. Copper, B. Arsenic, C. Lead, D. Mercury
B: Arsenic
Answer: B: Arsenic 
Explanation: 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