**Core Concept**
Tubercular meningitis (TBM) is a severe form of extrapulmonary tuberculosis that affects the meninges, the protective membranes covering the central nervous system (CNS). It is characterized by inflammation and infection of the meninges by Mycobacterium tuberculosis. The pathogenesis of TBM involves the hematogenous spread of M. tuberculosis from the lungs to the CNS, where it causes a severe inflammatory response.

**Why the Correct Answer is Right**
The correct answer is likely to be related to a feature that is not typically associated with tubercular meningitis. Tubercular meningitis is known for its characteristic presentation of **hydrocephalus**, **cerebral infarction**, and **cranial nerve palsies**. The inflammation and infection of the meninges can lead to the obstruction of cerebrospinal fluid (CSF) pathways, resulting in hydrocephalus. Additionally, the inflammation can cause vascular occlusion and cerebral infarction. Cranial nerve palsies are also common due to the involvement of the meninges surrounding the nerves.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because hydrocephalus is a common feature of tubercular meningitis, resulting from the obstruction of CSF pathways.
**Option B:** This option is incorrect because cerebral infarction is also a common feature of TBM, resulting from vascular occlusion caused by inflammation.
**Option C:** This option is incorrect because cranial nerve palsies are a common feature of TBM, resulting from the involvement of the meninges surrounding the nerves.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that tubercular meningitis often presents with a triad of fever, headache, and altered mental status, and that the diagnosis can be challenging due to the non-specific symptoms. A high index of suspicion and cerebrospinal fluid analysis are crucial for the diagnosis of TBM.

**Correct Answer: D.**