**Core Concept**
Saline infusion sonography (SIS) is a diagnostic technique used to evaluate the uterine cavity, particularly for assessing abnormalities such as polyps, fibroids, and adhesions. It involves the infusion of saline solution into the uterus under ultrasound guidance. This procedure helps in outlining the uterine cavity and provides a clear view of the internal structures.

**Why the Correct Answer is Right**
Since the question is incomplete, let's discuss the general principle of SIS. The infusion of saline helps to distend the uterine cavity, allowing for a better visualization of the endometrial lining and any potential lesions. This is particularly useful in patients with abnormal uterine bleeding or infertility.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, we cannot determine its correctness.
**Option B:** Similarly, option B's accuracy cannot be assessed without more information.
**Option C:** Option C also lacks context to evaluate its validity.
**Option D:** The same applies to option D, as the question is incomplete.

**Clinical Pearl / High-Yield Fact**
A key point to remember about SIS is that it is a valuable tool for diagnosing intrauterine abnormalities, especially when other imaging modalities like MRI or CT scans are not readily available or are contraindicated.

**Correct Answer:**