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: Forensic Medicine
A patient has sensation of bugs crawling all over his body; this may be an effect of: 
Select and explain. 
A. Cocaine, B. Alcohol, C. Cannabis, D. Benzodiazepines
A: Cocaine
Answer: A: Cocaine 
Explanation: This patient is having sensation of 'cocaine bugs' crawling in his body which is the effect of chronic cocaine poisoning. Ref: Parikh's Textbook of Medical Jurisprudence Forensic Medicine and Toxicology, 5th Edition, Page 917 and 6th Edition, Page 119 ; The Essentials of Forensic Medicine and Toxicology By K.S. Narayana Reddy, 27th Edition, Page 536