Question: A patient presents with hallucinations, euphoria, and extreme agitation. His history is significant for use of illicit drugs. On physical examination, his skin is reddish, with slurred speech, and a very unsteady gait. An eye examination reveals dilated pupils and nystagmus. Which of the following drugs was most likely taken? A. Cocaine B. Phencyclidine C. Amphetamine D. Marijuana