A 25-year-old Caucasian female presents to the ER complaining of unilateral pain in her lower back. She describes the pain as constant and 10 out of 10. She also reports a fever of 102.5°F and a...

A 25-year-old Caucasian female presents to the ER complaining of unilateral pain in her lower back. She describes the pain as constant and 10 out of 10. She also reports a fever of 102.5°F and a two-week history of painful, frequent urination. What is her diagnosis?

 A. Chronic pyelonephritis

 B. Nephrolithiasis

 C. Acute pyelonephritis

 D. Renal carcinoma