A breastfeeding woman developed endomyometriosis 3 days after her cesarean. She was treated with IV antibiotics and discharged home on oral antibiotics. On her 6th postpartum day, she returns to the hospital with fever, shaking chills, tachycardia, and flank pain. She has urinary frequency and urgency. The patient should be further assessed for
a. cystitis
b. pyelonephritis
c. wound infection