**Core Concept**
The prostate gland is divided into distinct zones, each with unique histological features and clinical significance. The peripheral zone accounts for approximately 70% of the gland's volume and is the most common site for prostate cancer development.

**Why the Correct Answer is Right**
The lesion described in the question, with small glands lined by a single layer of cells and enlarged nucleoli, is characteristic of adenocarcinoma, a common type of prostate cancer. The peripheral zone is the most likely origin of this cancer due to its high proportion of glandular tissue and its susceptibility to malignant transformation. The peripheral zone's glandular tissue is composed of small, branching glands lined by a single layer of columnar or cuboidal cells, which is consistent with the biopsy findings.

**Why Each Wrong Option is Incorrect**
**Option A:** The anterior zone is a small, fibromuscular region located between the prostatic urethra and the ejaculatory ducts. It is not a common site for prostate cancer development.
**Option B:** The central zone surrounds the ejaculatory ducts and is composed of a mixture of glandular and fibromuscular tissue. While it can be involved in prostate cancer, it is not the most common site.
**Option D:** The transition zone is located between the peripheral zone and the urethra, and its glandular tissue is more abundant in older men. While it is a common site for benign prostatic hyperplasia (BPH), it is not typically associated with prostate cancer.

**Clinical Pearl / High-Yield Fact**
Prostate cancer most commonly presents as a single, hard, irregular nodule in the peripheral zone, often discovered on rectal examination. The peripheral zone's glandular tissue is more prone to malignant transformation due to its higher cell turnover rate and increased exposure to androgens.

✓ Correct Answer: C. Peripheral zone