<prompt> Chronic cocaine abuse have following features except:Peripheral gangreneBlack staining of tongueFormicationRun amok  <response>: 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 impulsestabbing spree 