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. Which is the best explanation for this weight loss?1. The pharmacological action of Ritalin causes a decrease in appetite.2. Hyperactivity seen in ADHD causes increased caloric expenditure.3. Side effects of Ritalin can include nausea; therefore, caloric intake is decreased.4. Increased ability to concentrate allows the client to focus on activities rather thanfood.

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