**Core Concept**
The question is testing the student's knowledge of bone lesions, specifically a precancerous lesion. Osteoid osteoma is a benign bone tumor, but the question is asking for a precancerous lesion, which implies a lesion with a potential to develop into cancer. The correct answer is a type of bone lesion that is known to be precancerous.

**Why the Correct Answer is Right**
The correct answer is Osteochondroma. Osteochondroma is a type of bone tumor that is known to be precancerous. It is a benign tumor that arises from the metaphysis of long bones and can potentially transform into a malignant tumor, such as chondrosarcoma. Osteochondroma accounts for about 30-40% of all benign bone tumors and is the most common type of benign bone tumor.

**Why Each Wrong Option is Incorrect**
* **Option A:** Osteoid osteoma is a benign bone tumor that is not typically considered precancerous. While it can cause pain and other symptoms, it is not known to transform into a malignant tumor.
* **Option B:** Enchondroma is a type of benign bone tumor that arises from cartilage cells. While it can be found in the medullary cavity of long bones, it is not typically considered precancerous.
* **Option C:** Osteoblastoma is a rare benign bone tumor that is similar to osteoid osteoma. However, it is not typically considered precancerous.

**Clinical Pearl / High-Yield Fact**
Osteochondroma can be associated with hereditary multiple osteochondromas (HMO), a genetic disorder that affects the development of bones and cartilage.

**Correct Answer: C. Osteochondroma.**