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
Formication and delusion of persecution occurs together in intoxication with: 
Select and explain. 
A. Cocaine, B. Amphetamine, C. Cannabis, D. LSD
A: Cocaine
Answer: A: Cocaine 
Explanation: The complication of chronic cocaine use include acute anxiety reaction, uncontrolled compulsive behaviour, psychotic episodes with persecutory delusions and tactile hallucination (Formication), delirium and delusional disorder. In amphetamine abuse these two do not occur together: Formication (tactile hallucination) is seen in Chronic abuse. Paranoid ideation (delusion of persecution) occurs in Acute intoxication. Ref: A sho Textbook of Psychiatry Niraj Ahuja 6th Ed Page 50, 51.