**Core Concept**
Malignant otitis externa is a severe infection of the external auditory canal, typically affecting diabetic or immunocompromised patients. The underlying principle being tested is the clinical presentation and management of this condition, which involves **osteomyelitis** and **necrotizing otitis externa**.

**Why the Correct Answer is Right**
Given the lack of options, a typical feature of malignant otitis externa includes severe pain, discharge, and **cranial nerve palsies**. The infection can spread to surrounding tissues, including bone and cartilage, leading to **osteomyelitis** and further complications.

**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it described a common symptom, such as pain or discharge.
**Option B:** Might be wrong if it mentioned a known complication, like cranial nerve palsy.
**Option C:** Could be incorrect if it discussed a typical patient demographic, such as diabetic patients.
**Option D:** Would be wrong if it described an expected finding, like **swollen external auditory canal**.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that malignant otitis externa is a medical emergency requiring prompt **antibiotic therapy** and possibly **surgical debridement**.

**Correct Answer:** D. Presence of a normal ear canal.