A nurse is preparing a teaching plan for the parent of a school-age child who has asthma. Which of the following manifestations should the nurse include as an indication of an exacerbation of asthma?

A. Green zone reading on peak expiratory flow meter Green zone indicates 80–100% of personal best peak flow-this is not a sign of exacerbation. B. Rhinitis Rhinitis can be a trigger but is not a sign of an active asthma exacerbation. C. Axillary temperature of 37.2°C (99°F) This is a normal temperature for a child and not indicative of an asthma issue. D. Hacking nonproductive cough A persistent, dry, nonproductive (hacking) cough—especially at night—is a classic early sign of asthma exacerbation.