A 43-year-old man with acquired immunodeficiency syndrome (AIDS) is in the hospital for pneumonia. On his second hospital day, he reports difficulty swallowing his meals. He says that for the last month he has had difficulty swallowing food and medications. He also occasionally feels a burning pain in his upper chest when swallowing. He denies abdominal pain, nausea, or vomiting. Vital signs are: 37.0 C (98.6 F), blood pressure 129/88 mm Hg, pulse 80/min. Examination of his mouth reveals pink oral mucosa and a normal tongue. He has no significant cervical lymphadenopathy. Abdominal examination is normal. The patient's last CD4 count was performed 5 months ago and at that time was 190/mm3. The most appropriate next step in the management of this patient is to
A. order esophagogastroduodenoscopy (EGD)
B. order a Helicobacter pylori antibody test
C. prescribe a trial of antacids and schedule a follow-up appointment
D. prescribe oral acyclovir
E. prescribe oral fluconazole
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