7 A 29-year-old, previously healthy man suddenly collapses at a party where legal and illicit drugs are being used. Enroute to the hospital, he requires resuscitation with defibrillation to establish a normal cardiac rhythm. His vital signs are temperature, 40C; respirations, 30/min; heart rate, 110/min; and blood pressure, 175/90 mm Hg. Physical examination shows dilated pupils, a perforated nasal septum, and a prominent callus on the right thumb. CT scan of the head shows an acute right frontal lobe hemorrhage. Which of the following substances detectable in blood and urine is most likely responsible for these findings? (A) Ethanol (B) Heroin (C) Marijuana (D) Phencyclidine (E) Cocaine (F) Amphetamine (G) Barbiturate