Most common congenital anomaly of kidney: (A) Ectopic kidney, (B) Renal duplication, (C) Horse shoe kidney, (D) Renal agenesis
Answer is C. Congenital anomalies of kidney and urinary tract is phenotypically variable and can affect the kidney(s) alone and/or the lower urinary tract. The spectrum includes more common anomalies such as vesicoureteral reflux and, rarely, more severe malformations such as bilateral renal agenesis. ref - researchgate.net