Dialysis selectively removes urea, not glucose Steps:

• Dialysis filters blood to remove waste like urea via diffusion across a semi-permeable membrane.
• Urea concentration decreases as it diffuses into the dialysate.
• Glucose concentration remains stable, as dialysate matches blood glucose levels to prevent net diffusion.
• Select graph with falling urea line and flat glucose line.

Why C is correct:

• C depicts decreasing urea and constant glucose, aligning with dialysis principle of waste removal without altering essential solutes.

Why the others are wrong:

• A: Shows both decreasing, incorrectly implying glucose removal.
• B: Displays glucose rising, contradicting stable dialysate composition.
• D: Illustrates urea stable and glucose falling, reversing actual trends.

Final answer: C