A 23 year old male who is otherwise normal complains of mild pain in his right iliac fossa in a waveform pattern which increases during the night and he becomes exhausted and is admitted in the hospital.On examination there is mild hematuria.Urine examination levels plenty of RBC's 50 WBCs/hpf. Urine pH is 5.5.Most likely diagnosis is -

• A. Ca-Urinary bladder
• B. Glomerulonephritis
• C. Cystitis
• D. Ureteral calculus