75 - 90% of the nephron's are lost in which stage of chronic renal failure?  aAll of these stages bStage I cStage 3 dStage 2

To answer the question, we need to determine in which stage of chronic renal failure 75-90% of the nephrons are lost. Let's go through the options provided:

a) All of these stages: This option suggests that all stages of chronic renal failure result in the loss of 75-90% of the nephrons. However, this is not a specific stage and does not provide a clear answer.

b) Stage I: This option suggests that 75-90% of the nephrons are lost in Stage I of chronic renal failure. However, Stage I is typically characterized by mild kidney damage and does not involve such a significant loss of nephrons.

c) Stage 3: This option suggests that 75-90% of the nephrons are lost in Stage 3 of chronic renal failure. Stage 3 is known as the moderate stage, where there is a noticeable decrease in kidney function. This stage could potentially involve the loss of a significant number of nephrons.

d) Stage 2: This option suggests that 75-90% of the nephrons are lost in Stage 2 of chronic renal failure. Stage 2 is considered the early stage, where there is mild kidney damage. It is unlikely that such a high percentage of nephrons would be lost at this stage.

Based on the information provided, the most likely answer is c) Stage 3, as this stage is associated with a moderate decrease in kidney function, which could result in the loss of 75-90% of the nephrons.