This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
Formication and delusion of persecution, both are together seen in - 
Select and explain. 
A. LSD psychosis, B. Amphetamine psychosis, C. Cocaine psychosis, D. Cannabis psychosis
C: Cocaine psychosis
Answer: C: Cocaine psychosis 
Explanation: cocaine causes * Psychosis * Auditory or visual hallucinations * Altered tactile sensation: the person feel that some small insects are crawling on his skin. This is known as Magnan's symptom or cocaine bugs (formication). REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO 347