You are answering a USMLE-style medical question. Question: A 65-year-old previously healthy man presents to the primary care physician with the chief complaint of red colored urine over the past month. He states that he does not experience dysuria. On physical exam there is no costovertebral angle tenderness. With this presentation which is the most likely cause of this patient's hematuria? Options: A) Bladder tumor B) Renal cell carcinoma C) Beeturia D) Urinary tract infection Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.