**Core Concept**
Dacrocytorhinostomy (DCR) is a surgical procedure that aims to restore the normal drainage of tears from the eye into the nasal cavity by creating a new pathway for tear flow. This procedure is often required in cases of nasolacrimal duct obstruction or other conditions that affect tear drainage.

**Why the Correct Answer is Right**
The DCR procedure involves the creation of a new opening between the lacrimal sac and the nasal cavity, allowing tears to drain freely. This is typically achieved by removing a portion of the bone and mucous membrane that separates the lacrimal sac from the nasal cavity. The procedure is usually performed under general anesthesia and requires careful surgical technique to ensure proper drainage and minimize complications.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the primary purpose or mechanism of DCR.
**Option B:** This option is incorrect as it is not a recognized or commonly performed procedure for treating nasolacrimal duct obstruction.
**Option C:** This option is incorrect as it is not a specific or accurate description of the DCR procedure.

**Clinical Pearl / High-Yield Fact**
It is essential for ophthalmologists and otolaryngologists to carefully evaluate patients with nasolacrimal duct obstruction or other tear drainage issues to determine the best course of treatment, which may involve DCR or other procedures.

**Correct Answer:** C. Creation of a new opening between the lacrimal sac and the nasal cavity.