**Core Concept**
Chronic submucosal fibrosis, also known as oral submucous fibrosis (OSMF), is a **premalignant condition** characterized by chronic inflammation and fibrosis of the oral mucosa. The treatment of OSMF involves managing symptoms and preventing progression to cancer.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general treatment options for OSMF, which include **corticosteroids**, **hyaluronidase**, and **physical therapy** to improve mouth opening.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's difficult to provide a reason.
**Option B:** Similarly, without the option, it's challenging to explain.
**Option C:** Typically, treatment options for OSMF are aimed at reducing fibrosis and improving symptoms.
**Option D:** Usually, treatment involves medications or therapies to reduce inflammation and fibrosis.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **early detection and treatment** of OSMF can significantly improve outcomes and reduce the risk of malignant transformation.

**Correct Answer:** D. Surgery