**Core Concept**
Sensitivity in medical testing refers to the proportion of actual positives correctly identified by the test. A highly sensitive test is one that has a high likelihood of detecting the presence of a disease when it is present.

**Why the Correct Answer is Right**
A highly sensitive test will have a high true positive rate, meaning it will correctly identify most individuals with the disease. This is particularly useful in screening tests, where the goal is to detect as many cases as possible. In such scenarios, a highly sensitive test will help minimize the number of false negatives, thereby reducing the risk of missing a diagnosis.

**Why Each Wrong Option is Incorrect**
**Option A:** Specificity, not sensitivity, is the measure of a test's ability to correctly identify individuals without the disease.
**Option B:** A highly sensitive test does not necessarily mean it is highly specific; these are two separate properties of a test.
**Option C:** A highly sensitive test will indeed correctly identify most individuals with the disease, but this is not the same as saying it is highly specific.

**Clinical Pearl / High-Yield Fact**
When interpreting test results, it is essential to consider both sensitivity and specificity to understand the test's overall performance. A highly sensitive test may have a lower specificity, but it can still be useful in certain clinical contexts.

**Correct Answer: D.**