The Nurse Working in a Urology Clinic Receives a Call

The nurse working in a urology clinic receives a call from a patient who had a transurethral resection with fulguration for bladder cancer 3 days previously. Which information given by the patient is of most concern to the nurse?

A) The patient is voiding every 4 hours at night.
B) The patient is using opioids for pain.
C) The patient is very anxious about the cancer.
D) There are clots in the urine.