A patient presents to the emergency department with complaints of chills, severe flank pain, ...

C
The nurse should suspect pyelonephritis. Pyelonephritis is characterized by fever, chills, severe flank pain, dysuria, urinary urgency and frequency, as well as pyuria and bacteruria.
Clinical manifestations of acute cystitis include dysuria, urinary urgency and frequency, supra-pubic discomfort, pyuria, and bacteruria.
Urinary tract infections (UTIs) are very general and are classified by their location. These symp-toms are specific to pyelonephritis.
Prostatitis is manifested by high fever, chills, malaise, myalgia, localized pain, and various UTI symptoms, but not severe flank pain.

I hope they're paying you for this lol