【单选题】
肾功能失代偿期的饮食宜___
A. 高生物效价低蛋白饮食.高热量
B. 高生物效价高蛋白饮食.高热量
C. 高生物效价适量蛋白质.低热量
D. 高蛋白饮食，蛋白质种类不限.高热量
E. 低蛋白饮食，蛋白质种类不限.高热量
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