Apositive benedict’s test indicates the presence of a

The presence of glucose in urine symptom of dietaboietes 

The most appropriate instructions is to rinse mouth with antifungal medication as prescribed. This is because the client's symptoms are consistent with oral candidiasis which is common in clients taking antibiotics. The tongue will be further irritated if attempts are made to scrape off the coating or if the mouth is cleaned with peroxide. Since this is caused by antibiotic use, then another antibiotic for the tongue would not be prescribed.