**Core Concept**
Topical Mitomycin C is an antineoplastic agent used to prevent scarring and stenosis in various conditions. It works by inhibiting DNA synthesis and function, ultimately leading to cell death. In the context of ophthalmology and otolaryngology, Mitomycin C is applied topically to prevent fibrosis and promote tissue relaxation.

**Why the Correct Answer is Right**
The correct answer is D. Treatment for laryngeal stenosis. Mitomycin C is used topically in the treatment of laryngeal stenosis to prevent further narrowing of the airway. This is particularly useful in cases where endoscopic dilation or excision of the stenotic area has been performed. By inhibiting fibrosis, Mitomycin C helps maintain the patency of the airway and prevents recurrence of the stenosis. This is a critical application of Mitomycin C in the field of otolaryngology.

**Why Each Wrong Option is Incorrect**
**Option A:** Endoscopic treatment of angiofibroma is not a typical application of Mitomycin C. Angiofibromas are benign tumors of the nasal cavity and paranasal sinuses, and treatment usually involves surgical excision or embolization. Mitomycin C is not a standard adjuvant therapy in this condition.

**Option B:** Treatment of skull base osteomyelitis is not a common use of Mitomycin C. Osteomyelitis of the skull base is a serious infection that requires broad-spectrum antibiotics and possibly surgical debridement. Mitomycin C is not typically used in the treatment of osteomyelitis.

**Option C:** Sturge Weber syndrome is a congenital condition characterized by a port-wine stain, glaucoma, and seizures. While Mitomycin C may be used in the treatment of glaucoma, it is not a primary treatment for Sturge Weber syndrome.

**Clinical Pearl / High-Yield Fact**
Mitomycin C is a potent inhibitor of fibrosis and can be used to prevent scarring in various conditions. It is essential to note that Mitomycin C should be used judiciously and in combination with other treatments, as it can cause corneal ulcers and other side effects when used excessively.

✓ Correct Answer: D. Treatment for laryngeal stenosis.