**Core Concept**
The question tests the understanding of complications arising from Chronic Suppurative Otitis Media (CSOM), focusing on intracranial involvement. CSOM can lead to various intracranial complications due to the spread of infection.

**Why the Correct Answer is Right**
The most common intracranial complication of CSOM is meningitis, due to the direct spread of infection from the middle ear to the meninges. This occurs through pre-existing pathways such as the cochlear aqueduct or through bony erosions.

**Why Each Wrong Option is Incorrect**
**Option A:** Not specified, assuming it's not meningitis, it would be incorrect as it doesn't represent the most common complication.
**Option B:** Similarly, without specification, if it's not meningitis, it's incorrect.
**Option C:** If assuming it's an option other than meningitis, it's incorrect due to meningitis being the most common.
**Option D:** Same reasoning as above, if not meningitis, it's incorrect.

**Clinical Pearl / High-Yield Fact**
Meningitis is a critical and potentially life-threatening complication of CSOM, emphasizing the need for prompt diagnosis and treatment of middle ear infections to prevent such outcomes.

**Correct Answer:** D. Meningitis.