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
Magnan's symptom is seen in? 
Select and explain. 
A. Datura poisoning, B. Cocaine poisoning, C. Cannabis sativa poisoning, D. Cannabis indica poisoning
B: Cocaine poisoning
Answer: B: Cocaine poisoning 
Explanation: Magnan's or cocaine bugs is characteristic of cocaine poisoning, in which there is a feeling as if grains of sand are lying under the skin or some small insects are creeping on the skin giving rise to itching sensation with resultant excoriation, leading to irregular scratches and ulcers.Ref: The Essentials of Forensic Medicine and Toxicology 29th Ed Page 545.