**Core Concept**
The **filtration fraction** is the ratio of the glomerular filtration rate (GFR) to the renal plasma flow (RPF), and it is a key concept in understanding renal physiology. This fraction represents the proportion of plasma flowing through the kidneys that is actually filtered through the glomeruli.

**Why the Correct Answer is Right**
The normal value of filtration fraction is typically around 0.2 or 20%, meaning that about 20% of the plasma flowing through the kidneys is filtered through the glomeruli. This value is a result of the balance between the hydrostatic and oncotic pressures in the glomeruli and the permeability of the glomerular capillaries.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the normal range of filtration fraction.
**Option B:** Similarly, this option is also incorrect as it is not within the established normal range for filtration fraction.
**Option C:** This option is incorrect because the filtration fraction is not typically this high in a normal individual.

**Clinical Pearl / High-Yield Fact**
The filtration fraction is an important indicator of renal function, and changes in this fraction can indicate various pathological conditions. For example, a decreased filtration fraction can indicate a decrease in glomerular function.

**Correct Answer:** Correct Answer: B. 20% or 0.2