A nurse is reinforcing teaching with the parents of a child who has ADHD and is taking methylphenidate. Which of the following statements by the parents indicates that the medication is effective?

A. "Our child has increased his daily caloric intake." Methylphenidate is a stimulant that commonly suppresses appetite, leading to decreased caloric intake and potential weight loss. An increase in appetite would not indicate medication effectiveness but might suggest the dose is too low or the medication is wearing off. B. "Our child is able to complete his homework on time." Methylphenidate is used to improve attention, impulse control, and focus in children with ADHD. The ability to complete tasks, such as finishing homework on time, demonstrates improved concentration and executive functioning, which indicates the medication is working effectively. C. "Our child has a better grasp of reality." ADHD is not primarily associated with a loss of reality testing, as seen in psychotic disorders. While methylphenidate improves focus and impulse control, it does not target symptoms such as delusions or hallucinations. D. "Our child has lost some weight since his last appointment." Weight loss is a common side effect of methylphenidate due to appetite suppression. While this can be monitored, it does not indicate medication effectiveness in treating ADHD symptoms.