**Core Concept**
Accessory renal arteries are anomalous blood vessels that arise from the aorta or its branches, supplying blood to the kidneys. These vessels develop from the degeneration of the mesonephric arteries, a remnant of the embryonic kidney development.

**Why the Correct Answer is Right**
Accessory renal arteries may originate from various locations, including the aorta, inferior mesenteric artery, or the common iliac arteries. They can encircle around the kidney, a characteristic feature that distinguishes them from the normal renal arteries. Additionally, accessory renal arteries may also cause hydronephrosis by obstructing the ureteral blood supply or compressing the renal pelvis. This condition can lead to impaired kidney function and potentially severe consequences.

**Why Each Wrong Option is Incorrect**
**Option A:** While accessory renal arteries do develop from the degeneration of the mesonephric arteries, this statement is incomplete as it does not mention the potential origin from other vessels.

**Option B:** This statement is correct but incomplete as it does not mention the other possible consequences of accessory renal arteries.

**Option C:** This statement is correct but incomplete as it does not mention the origin and encirclement characteristics of accessory renal arteries.

**Clinical Pearl / High-Yield Fact**
It is essential to note that accessory renal arteries are a common variation, found in approximately 30% of individuals. During surgical procedures, such as nephrectomy or renal transplantation, knowledge of these anomalous vessels is crucial to avoid complications.

**✓ Correct Answer: D. All of above**