<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 7-year-old girl is brought to the physician with complaints of recurrent episodes of dysuria for the past few months. Her parents reported 4 to 5 similar episodes in the last year. They also note that she has had several urinary tract infections throughout her childhood. She has no other medical problems and takes no medications. Her temperature is 38.6oC 101.4F, pulse is 88min, and respiratory rate is 20min. On physical examination, suprapubic tenderness is noted. On ultrasonography, hydronephrosis and scarring are present. Which of the following is the most appropriate next step?? A: Complete blood count, B: Ultrasonography of the abdomen and pelvis, C: Urine culture and sensitivity, D: Voiding cystourethrogram, E: Magnetic resonance imaging,  <response>: This is a clinical case about a 7-year-old girl with recurrent urinary tract infections and dysuria. From the history and physical exam findings of fever, suprapubic tenderness, and ultrasound showing hydronephrosis and scarring, this patient likely has vesicoureteral reflux leading to pyelonephritis. The question asks for the most appropriate next step. Choice A, a complete blood count, would not provide any further useful information. Choice B, repeat ultrasound, has already been done. Choice C, urine culture, is important for diagnosis and treatment but does not provide anatomical information about the cause of the infections. Choice D, a voiding cystourethrogram, allows visualization of vesicoureteral reflux and is the test of choice for evaluating the anatomical abnormality leading to the recurrent infections. Choice E, MRI, may be useful for further evaluation but is not the next most appropriate test.D: Voiding cystourethrogram 