**Core Concept**
Primary grade 5 vesicoureteric reflux (VUR) is a condition where urine flows retrogradely from the bladder into the kidneys due to a congenital anomaly of the ureterovesical junction, leading to potential renal scarring and pyelonephritis. In children, the primary goal of treatment is to prevent recurrent urinary tract infections (UTIs) and preserve renal function.

**Why the Correct Answer is Right**
The American Academy of Pediatrics recommends a non-surgical approach for primary grade 5 VUR in children, particularly in those less than 2 years old. This involves the use of prophylactic antibiotics to prevent UTIs, with a focus on trimethoprim-sulfamethoxazole or nitrofurantoin. The goal is to reduce the risk of pyelonephritis and subsequent renal scarring. In some cases, a voiding diary may be used to monitor for UTIs and adjust the treatment plan accordingly.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is a surgical intervention, which is generally reserved for cases of VUR that do not respond to medical management or in patients with a history of recurrent pyelonephritis.

**Option B:** This option is incorrect as it is a treatment for UTIs, not VUR. While treating UTIs is an essential part of managing VUR, it does not address the underlying anatomical issue.

**Option C:** This option is incorrect as it is a treatment for UTIs, not VUR. In addition, the use of cranberry juice is not supported by evidence as a prophylactic measure for UTIs.

**Clinical Pearl / High-Yield Fact**
In children with primary grade 5 VUR, regular follow-up with ultrasound and urine cultures is essential to monitor for renal scarring and UTIs. Early detection and treatment can significantly reduce the risk of long-term renal damage.

**Correct Answer:** C.