11 . A 15-year-old patient is brought to the emergency department for agitation and paranoia. The patient seems to be hallucinating, and comments that, "I'm walking on air." Physical examination reveals tachycardia. This clinical picture is most characteristic on
A. cocaine withdrawal.
B. caffeine intoxication.
C. marijuana withdrawal.
D. prescription opioid withdrawal.
E. dextromethorphan intoxication