30)ANSWER

A. Weakness and fatigue

RATIONALE

•Erythropoietin is synthesized in the renal cortex. A decrease in production related to CRF leads to anemia, manifesting as weakness and fatigue. Dyspnea, pallor, malaise, and poor concentration are also common symptoms of anemia.

•Nausea is not associated with anemia.

•Intercostal retractions, cyanosis, and hypercapnia are generally related to problems with ventilation and perfusion.