A Patient Is Thin, Tense, Jittery, and Has Dilated Pupils

Multiple Choice

A patient is thin, tense, jittery, and has dilated pupils. The patient says, "My heart is pounding in my chest. I need help." The patient allows vital signs to be taken but then becomes suspicious and says, "You could be trying to kill me." The patient refuses further examination. Abuse of which substance is most likely?

A) PCP
B) Heroin
C) Barbiturates
D) Amphetamines