This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
Tactile hallucinations are noticed in 
Select and explain. 
A. Parkinsonism, B. Chronic depression, C. Chronic cocaine poisoning, D. Acute barbiturate poisoning
C: Chronic cocaine poisoning
Answer: C: Chronic cocaine poisoning 
Explanation: Magnan's Syndrome / Cocaine Bugs This is seen in cocaine addicts. It is a type of tactile hallucination. There is a feeling as if grains of sand are lying under the skin or small insects are creeping on the skin giving rise to itching sensation (formication).