单选题 The most significant sign of acute renal failure is
A. elevated body temperature.
B. increased blood pressure.
C. decreased urine output.
D. increased urine specific gravity.

【正确答案】 C

【答案解析】A sudden change in urine output is typical of acute renal failure. Most commonly, the initial change is greatly decreased urine output. Later in the course of acute renal failure, the client may have marked diuresis (nonoliguric failure).