This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drug Abuse, Subject name: Forensic Medicine
Chronic cocaine abuse have following features except: 
Select and explain. 
A. Peripheral gangrene, B. Black staining of tongue, C. Formication, D. Run amok
D: Run amok
Answer: D: Run amok 
Explanation: Cocaine : Fatal dose: 1g oral/ 20 mg IV Chronic cocaine abuse: a) Ulceration of nasal septum / palate b) Peripheral gangrene c) Black color staining of tongue d) Cocaine bugs/ formication Chronic cannabis abuse: a. Amotivational syndrome b. Run amok: homicidal impulse/stabbing spree