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
The sensation of creeping bugs over the body is a feature of which of the following poison? 
Select and explain. 
A. Cocaine, B. Diazepam, C. Barbiturates, D. Brown sugar
A: Cocaine
Answer: A: Cocaine 
Explanation: Magnan's symptom or cocaine bugs is a characteristic feature of cocaine poisoning. In this patient's feels as if grains of sand are lying under the skin or small insects (cocaine bugs) are creeping on the skin (formication) giving rise to itching sensation, with resultant excoriation leading to irregular scratches and ulcers. Ref: Essentials of Forensic Medicine and Toxicology By Dr K S Narayan Reddy, 27th Edition, Pages 535-6