After an Adolescent Diagnosed with Attention Deficit-Hyperactivity Disorder (ADHD)begins Methylphenidate

After an adolescent diagnosed with attention deficit-hyperactivity disorder (ADHD) begins methylphenidate (Ritalin) therapy,a nurse notes that the adolescent loses 10 pounds in a 2-month period.What is the best explanation for this weight loss?

A) The pharmacological action of Ritalin causes a decrease in appetite.
B) Hyperactivity seen in ADHD causes increased caloric expenditure.
C) Side effects of Ritalin cause nausea; therefore, caloric intake is decreased.
D) Increased ability to concentrate allows the client to focus on activities rather than food.