**Core Concept**
The **CA-125** tumor marker is commonly used in the monitoring and follow-up of patients with **ovarian cancer**. Elevated levels can also be seen in other conditions, making it essential to understand its specificity and sensitivity.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general concept. **CA-125** levels can be increased in various conditions such as **ovarian cancer**, **endometriosis**, **pregnancy**, and **pelvic inflammatory disease**.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, we cannot determine why it is incorrect.
**Option B:** Similarly, without the specific option, we cannot provide a reason.
**Option C:** Same as above.
**Option D:** Same as above.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that **CA-125** is not specific to **ovarian cancer** and can be elevated in various benign and malignant conditions.

**Correct Answer:** D.