**Question:** Calcification of basal ganglia is seen in A/E:

A. Hypertension
B. Parkinson's disease
C. Trauma
D. Congenital disorders

**Core Concept:**
The basal ganglia are a group of subcortical nuclei located in the brain. They play a crucial role in regulating motor functions, cognition, emotions, and behavior. Calcification of the basal ganglia refers to the deposition of calcium salts within these nuclei, leading to tissue damage and dysfunction.

**Why the Correct Answer is Right:**
The basal ganglia can be affected by various pathological processes leading to calcification. In this case, the correct answer is B. Parkinson's disease (PD), a neurodegenerative disorder, is characterized by the accumulation of Lewy bodies and neurofibrillary tangles within the basal ganglia neurons. This process results in the loss of dopaminergic neurons and impaired motor control, cognitive function, and emotional regulation, which are the cardinal features of PD.

**Why Each Wrong Option is Incorrect:**
A. Hypertension (option A) can cause vascular damage to the basal ganglia, but calcification is not a common feature.
C. Trauma (option C) can cause hemorrhage or contusion in the basal ganglia, but calcification is not a typical consequence.
D. Congenital disorders (option D) are not directly associated with basal ganglia calcification as commonly seen in the other options.

**Clinical Pearl:**
Basal ganglia calcification should prompt a thorough evaluation for the underlying cause, as it can lead to severe neurological dysfunction. Understanding the core concepts of neurodegenerative disorders, such as Parkinson's disease, is essential for accurate diagnosis and appropriate management.

**Correct Answer:**
B. Parkinson's disease