**Core Concept**
Pleomorphic adenoma, also known as benign mixed tumor, is a common type of salivary gland tumor. It is characterized by its pleomorphic appearance under microscopic examination, containing both epithelial and mesenchymal components. Treatment of pleomorphic adenoma depends on the tumor's size, location, and whether it has infiltrated surrounding structures.

**Why the Correct Answer is Right**
The correct treatment for pleomorphic adenoma without fascial nerve infiltration and limited to the superficial lobe is surgical excision. This approach involves complete removal of the tumor along with a margin of normal tissue to prevent recurrence. The superficial lobe of the parotid gland is the most common location for pleomorphic adenomas. Enucleation, a technique where the tumor is carefully dissected from the surrounding gland, is often used for smaller tumors in this location.

**Why Each Wrong Option is Incorrect**
**Option A:** Suggested treatment for pleomorphic adenomas with facial nerve involvement is more extensive surgery, such as a subtotal parotidectomy or a nerve-sparing procedure, which is not indicated in this scenario.

**Option B:** Radiation therapy is not the primary treatment for pleomorphic adenomas, as these tumors are benign and surgery is usually curative. Radiation might be considered for malignant salivary gland tumors or in cases where surgery is not feasible.

**Option C:** Chemotherapy is not a standard treatment for pleomorphic adenomas, as these tumors are benign and not responsive to systemic chemotherapy.

**Option D:** Obstruction of the facial nerve or its branches by a pleomorphic adenoma warrants a more aggressive surgical approach, such as a nerve-sparing procedure or subtotal parotidectomy, which is not indicated in this scenario.

**Clinical Pearl / High-Yield Fact**
When treating pleomorphic adenomas, it is essential to differentiate between benign and malignant tumors, as the latter require more aggressive management.

**Correct Answer:** A. Surgical excision of the tumor is the recommended treatment for pleomorphic adenoma without fascial nerve infiltration and limited to the superficial lobe.