**Question:** Type of cataract in chalicosis is -

A. Nuclear cataract
B. Posterior subcapsular cataract
C. Lenticular sclerosis
D. Cortical cataract

**Correct Answer:** D. Cortical cataract

**Core Concept:** Chalicosis refers to a type of occupational disease caused by prolonged exposure to chalk dust, which is primarily composed of calcium carbonate (CaCO3). Chalicosis is characterized by calcium deposition within the lens capsule, leading to a specific type of cataract.

**Why the Correct Answer is Right:** Chalicosis-related cataracts arise from the deposition of calcium carbonate within the lens capsule. The correct answer, cortical cataract, is a type of cataract that develops due to calcium deposition on the lens cortex (outer layer) and results in a characteristic "salt-and-pepper" appearance of the lens.

**Why Each Wrong Option is Incorrect:**

A. Nuclear cataract: This type of cataract develops within the lens nucleus (central part) due to aging or other factors, not related to chalicosis.
B. Posterior subcapsular cataract: This type of cataract forms on the back surface of the lens capsule, which is not relevant in chalicosis.
C. Lenticular sclerosis: This term is not specific to chalicosis and refers to hardening of the lens due to aging or other factors, not related to calcium deposition from chalk dust exposure.

**Clinical Pearl:** Chalicosis and its associated cataracts serve as a reminder of the importance of occupational safety measures to prevent lens damage from dust exposure in workplace settings. Workers in industries involving chalk, calcium carbonate, or other dusts should be aware of these potential health risks and take preventive measures.