This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Jet black pigmentation of tongue with tactile and visual hallucination is feature of which poisoning - 
Select and explain. 
A. Cocaine, B. Arsenic, C. Cannabis, D. Heroin
A: Cocaine
Answer: A: Cocaine 
Explanation: Black pigmentation of tongue and tactile hallucination occur in cocaine abuse.