Review Question - QID 214754

A 28-year-old woman comes to the office for follow-up evaluation of a chronic cough. For the past 3 months, she has had a nonproductive cough that is worse at night and frequent throat clearing during the day. She denies any accompanying chest pain, rhinorrhea, difficulty breathing, difficulty swallowing, or worsening of the cough with food. She is otherwise healthy and has no medical conditions. She has tried over-the-counter lozenges, herbal cough remedies, and calcium carbonate with little relief. She exercises regularly and has not noticed a change in her exercise tolerance. Her temperature is 98.6°F (37°C), blood pressure is 110/70 mmHg, pulse is 68/min, and respirations are 12/min. Cardiopulmonary examination and a chest radiograph show no abnormalities. Follow-up pulmonary function testing from her last visit reveals a normal FEV1 (forced expiratory volume in one second). Which of the following is the most appropriate next step in management?