## Core Concept
Chronic dacrocystitis refers to a persistent inflammation of the lacrimal sac, often due to a blockage in the nasolacrimal duct. This condition can lead to recurrent infections and tearing. The treatment aims to relieve the obstruction and infection.

## Why the Correct Answer is Right
The correct answer, **Dacryocystorhinostomy (DCR)**, is a surgical procedure that creates a new passageway for tears to drain into the nasal cavity, bypassing any blockage in the nasolacrimal duct. This procedure is often recommended for patients with chronic dacrocystitis who do not respond to conservative treatments like antibiotics and who have significant symptoms. DCR can be performed endoscopically or through an external approach.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is blank and does not provide a viable treatment choice.
- **Option B:** This option is also blank and does not offer a valid treatment for chronic dacrocystitis.
- **Option C:** Similarly, this option is blank and lacks a specific treatment alternative.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **DCR** is a definitive treatment for chronic dacrocystitis, especially when there's a significant blockage. Conservative management may include antibiotics for acute infections, but recurrent or chronic cases often require surgical intervention like DCR to prevent complications such as orbital cellulitis or abscess formation.

## Correct Answer Line
**Correct Answer: D. Dacryocystorhinostomy (DCR).**