Pedro is at a party and has taken a substance that has made him euphoric and disinhibited; he then experiences lethargy, loss of coordination, and other signs of central nervous system depression.He has most likely taken:

A) amphetamines.
B) cocaine.
C) benzodiazepines.
D) coffee.

The symptoms described suggest that Pedro has taken a central nervous system depressant, and benzodiazepines are a common class of drugs that produce these effects. Amphetamines and cocaine are stimulants and would not produce lethargy or central nervous system depression. Coffee is a stimulant that would not produce such extreme effects.