The observation that ________ is an effective treatment for attention-deficit/hyperactivity (ADHD) suggests that ADHD results from ________
A) methylphenidate; understimulation of dopamine transmission
B) haloperidol; overstimulation of dopamine transmission
C) fluoxetine; a deficit in serotonin transmission
D) fenfluramine; overstimulation of serotonin transmission
E) methylphenidate; overstimulation of dopamine transmission
Answer: A
Rationale: The observation that methylphenidate is an effective treatment for attention-deficit/hyperactivity (ADHD) suggests that ADHD results from understimulation of dopamine transmission.
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