## **Core Concept**
External otitis, also known as **swimmer's ear**, is an inflammation of the external auditory canal. This condition can be caused by bacterial or fungal infections, often resulting from exposure to moisture. It leads to symptoms such as ear pain, itching, and discharge.

## **Why the Correct Answer is Right**
The correct answer, **swimmer's ear**, is a common name for external otitis because the condition frequently occurs in individuals who spend a lot of time in water, such as swimmers. The moisture in the ear canal provides an ideal environment for bacterial growth, leading to infection and inflammation. This condition is effectively treated with topical antibiotics and anti-inflammatory medications.

## **Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a recognized term for external otitis.
* **Option B:** This option is incorrect as it does not correspond to a widely acknowledged synonym for external otitis.
* **Option C:** This option might seem plausible but does not accurately represent a commonly used term for external otitis.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **prevention of external otitis** involves keeping the ear canal dry, especially after swimming or bathing. Using earplugs and drying the ears thoroughly can help reduce the risk of developing this condition.

## **Correct Answer:** D. Swimmer's ear.