A nurse is collecting data from a client who received diphenhydramine 1 hr ago after developing an allergic reaction to trimethoprim- sulfamethoxazole. Which of the following statements by the client should indicate to the nurse that the medication is effective?

A. Headache relief may not be a direct indication of the effectiveness of diphenhydramine for an allergic reaction. B. Improvement in symptoms related to the allergic reaction, such as hoarseness, suggests the effectiveness of diphenhydramine. C. Changes in appetite are not typically related to the antihistamine effects of diphenhydramine. D. Alertness is not a specific indicator of the antihistamine effects of diphenhydramine.