A 45-year-old HIV-positive patient presents to the emergency department with complaints of difficulty swallowing and retrosternal chest pain for the past two weeks. The patient reports white patches in the mouth and a burning sensation when eating. Which of the following is the most appropriate initial management?
A
Oral fluconazole
B
Intravenous acyclovir
C
Oral nystatin suspension
D
Oesophageal biopsy
E
Proton pump inhibitor therapy