Preferred therapy for an uncomplicated UTI in an otherwise healthy 36-year-old woman with sulfa allergy and where the local E. coli resistance rate to trimethoprim-sulfamethoxazole is 18% would be:
a. Trimethoprim-sulfamethoxazole.
b. Amoxicillin.
c. Nitrofurantoin.
d. Cephalexin,
