Mainlining is -: (A) Cocaine addiction, (B) Homicidal cut wounds, (C) Drug addicts using main veins for injecting drugs, (D) Suicidal cut wounds
Answer is C. Most persistent drug abusers follow a classic progression from sniffing (similar to oral route) to skin popping (subcutaneous route), to mainlining (intravenous route) - each step bringing more intense experience, a higher addiction liability. With mainlining the initial 'thrill' is more intense.