**Core Concept**
Fibrous dysplasia is a benign bone disorder characterized by abnormal growth and replacement of normal bone tissue with fibrous connective tissue, leading to weakened bones and potentially disfiguring deformities. It is a non-neoplastic condition, which distinguishes it from malignant bone tumors.

**Why the Correct Answer is Right**
Conservative surgery is the preferred treatment approach for fibrous dysplasia, aiming to alleviate symptoms and prevent complications without causing unnecessary damage to surrounding tissues. This involves careful planning and execution to avoid exacerbating the condition or causing further deformity. The goal is to restore function and prevent progression of the disease. In some cases, surgical intervention may be necessary to address specific complications such as pathological fractures or cosmetic concerns.

**Why Each Wrong Option is Incorrect**
**Option A:** Surgical excision is not a recommended treatment for fibrous dysplasia, as it can lead to further damage to the affected bone and surrounding tissues, potentially causing more harm than good.

**Option B:** Removal of adjacent teeth is not a relevant treatment for fibrous dysplasia, as the condition primarily affects bone tissue, not dental structures.

**Option C:** Irradiation of the lesion is not a recommended treatment for fibrous dysplasia, as radiation therapy can cause further damage to surrounding tissues and exacerbate the condition.

**Clinical Pearl / High-Yield Fact**
Fibrous dysplasia can be classified into three main subtypes: monostotic (affecting a single bone), polyostotic (affecting multiple bones), and craniofacial (affecting the skull and facial bones). Understanding the specific characteristics of each subtype is crucial for accurate diagnosis and treatment planning.

**✓ Correct Answer: D. Conservative surgery. Conservative surgery is the preferred treatment approach for fibrous dysplasia, aiming to alleviate symptoms and prevent complications without causing unnecessary damage to surrounding tissues.**