题目：
A client is hospitalized with a diagnosis of chronic glomerulonephritis. The client mentions that she likes salty foods. The nurse should warn her to avoid foods containing sodium because
A．reducing sodium promotes urea nitrogen excretion.
B．reducing sodium decreases edema.
C．reducing sodium improves her glomerular filtration rate.
D．reducing sodium increases potassium absorption.
答案：
参考答案：B
解析：Reducing sodium intake reduces fluid retention. Fluid retention increases blood volume, which changes blood vessel permeability and allows plasma to move into interstitial tissue, causing edema. Urea nitrogen excretion can be increased only by improved renal function. Sodium intake doesn't affect the glomerular filtration rate. Potassium absorption is improved only by increasing the glomerular filtration rate; it isn't affected by sodium intake.
