**Core Concept**
The kidney is a complex organ with a distinct structure, comprising the renal cortex, renal medulla, and the renal pelvis. Understanding its anatomical features is crucial for diagnosing and managing various renal disorders.

**Why the Correct Answer is Right**
The renal cortex is the outermost layer of the kidney, responsible for filtering waste products from the blood. It is composed of renal corpuscles, which contain glomeruli, and renal tubules, which reabsorb essential nutrients and ions. The renal medulla is the innermost layer, consisting of the renal pyramids and the renal columns. The renal pelvis is a funnel-shaped structure that collects urine from the calyces and directs it into the ureter. Each kidney has a single renal pelvis, which is a characteristic distinguishing it from other organs.

**Why Each Wrong Option is Incorrect**
**Option A:** (Not provided) - This option is not available, so we'll move on to the other options.

**Option B:** (Not provided) - This option is not available, so we'll move on to the other options.

**Option C:** (Not provided) - This option is not available, so we'll move on to the other options.

**Clinical Pearl / High-Yield Fact**
The renal pelvis is a unique structure that allows for the collection and concentration of urine before its excretion. This is essential for maintaining proper renal function and preventing urinary tract infections.

**Correct Answer:** Not provided

✓ Correct Answer: D. The right renal aery arises from the aoa passing anterior to the vena cava and enters the kidney at the hilus