This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urography, Subject name: Radiology
Which of the following investigation is preferred for diagnosis of vesicoureteric reflux: 
Select and explain. 
A. Intravenous urography, B. Micturating cystourethrogram, C. Retrograde pyelography, D. Ultrasonography
B: Micturating cystourethrogram
Answer: B: Micturating cystourethrogram 
Explanation: Ans. (b) Micturating cystourethrogramRef: SRB Manual of Surgery 4th ed. /1118Steps in MCU# Catheterization to fill the bladder with a radio- contrast agent, typically cystografin.# Under fluoroscopy, we can see the contrast entering the bladder.# If the contrast moves into the ureters and back into the kidneys, the radiologist makes the diagnosis of vesicoureteral reflux.Indication of MCU* All males with recurrent UTIs, or abnormality on ultrasound if first UTI urinary tract infection* First episode UTI in females < 3 years of age* Febrile UTIs in females < 5 years of age* Older females with pyelonephritis or recurrent UTIs* Suspected obstruction (e.g. Bilateral hydronephrosis)* Suspected bladder trauma or rupture* Stress incontinence (urine)