This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance abuse, Subject name: Psychiatry
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: The complications of chronic cocaine use include acute anxiety reaction, uncontrolled compulsive behaviour, psychotic episodes (with persecutory delusions, and tactile and other hallucinations), delirium and delusional disorder. Formication is tactile hallucination of bugs crawling. Ref: Sho textbook of Psychiatry by Niraj Ahuja, 7th editon, page 47.