A 59-year-old male presents to the emergency department complaining of fever, chills and dysuria for the past 24 hours....

A 59-year-old male presents to the emergency department complaining of fever, chills and dysuria for the past 24 hours. Past medical history is significant for hypothyroidism, hypertension and obesity. Vital signs reveal a temperature of 38.4°C (101.2°F), blood pressure of 146/79mm/Hg, heart rate 92/min, respiratory rate of 18/min, and an oxygen saturation of 96% on room air. Physical examination reveals normal external genitalia, non-tender testes, and an exquisitely tender prostate on rectal exam. The most appropriate management is

1. amoxicillin-clavulanate
2. ampicillin
3. ceftriaxone plus doxycycline
4. nitrofurantoin
5. trimethoprim-sulfamethoxazole