This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance Related and Addictive Disorders, Subject name: Psychiatry
Formication is seen 
Select and explain. 
A. Cannabis, B. Cocaine, C. Opioids, D. Ecstasy
B: Cocaine
Answer: B: Cocaine 
Explanation: Formication - also know as magnan phenomenon or cocaine bugs it is tactile type of hallucination seen in cocaine intoxication Jet black pigmentation - also seen in cocaine Flashback phenomenon / run amok / amotivational syndrome - seen in cannabis Flu like syndrome (water from everywhere - lacrimation, sweating, rhinorrhea and diarrhea) seen in opioids withdrawal