Which of the following results from obstruction of the left ureter by a renal calculus?

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Obstruction of the left ureter by a renal calculus would result in an attack of renal colic, which is a severe pain in the flank area that radiates to the groin. Mild flank pain (A) may be present initially but usually progresses to severe pain. Hydronephrosis (B) is the swelling of the kidney due to urine buildup caused by obstruction, but it is unlikely to occur in both kidneys simultaneously. Immediate cessation of urine production (C) is not a common manifestation of ureteral obstruction.

Which of the Following Results from Obstruction of the Left