ITE 2014 Q113.
A 55-year-old male with diabetes mellitus is found to have asymptomatic microscopic hematuria. The rest of his urinalysis is negative. He has no other medical problems and quit smoking 10 years ago. His only medication is metformin (Glucophage). A urine culture is negative and his renal function is normal. CT urography is also negative. Which one of the following should be the next step in the evaluation of his microscopic hematuria ?

A) Urine cytology
B) Cystoscopy
C) Nephrology referral
D) Stopping metformin and performing a repeat urinalysis
E) Antibiotic therapy