<prompt> A 65 year old male smoker presents with gross total painless hematuria. Which of the following is the most likely diagnosis?CystolithiasisCarcinoma prostateCarcinoma of urinary bladderBenign prostatic hyperplasia  <response>: Patient in the question is 65 years old and is a smoker, both these factors predispose to the development of bladder carcinoma. And he is presenting with painless hematuria which is by far the most common symptom and indicator of bladder carcinoma until proven otherwise. Ref: Bailey and Loves Sho Practice of Surgery, 23rd Edition, Pages 1360-3. 