A 55- year old man presents to your office with 6 month histor of non- productive cough, especially at night. He denies postnasal drip, difficulty breathing, of wheezing. His only other complaint is water brash. His past medical history is insignificant, and he is not taking any medication. He doesn't smoke or consume alcohol. Physical examination is significant. Chest X-ray and pulmonary function testing are normal. Esophageal is also normal.
What is the next step in management of this patient?
a) Esophageal mucosal biopsy.
b) 24-hour pH recording.
c) Barium swallow.
d) Bernstein test.
