Hunan hand occurs due to: NEET 14
**Core Concept**
Hunan hand is a rare occupational disease characterized by a condition where the skin of the hand becomes hardened and thickened due to prolonged exposure to a specific chemical or physical agent. This condition is often seen in individuals working with certain metals or chemicals.
**Why the Correct Answer is Right**
The correct answer is related to the exposure to a specific chemical, specifically hexavalent chromium (Cr6+). Hexavalent chromium is a known skin irritant that can cause chronic dermatitis and skin thickening upon prolonged exposure. The skin thickening is due to the accumulation of collagen and other proteins in the dermis, leading to the characteristic hardened and thickened appearance of the skin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify a chemical or physical agent known to cause Hunan hand. While certain other chemicals may cause skin irritation, they are not directly associated with Hunan hand.
**Option B:** This option is incorrect as it is a general term that does not specifically relate to Hunan hand. Occupational dermatitis is a broad category that encompasses many different conditions, but it does not directly explain the etiology of Hunan hand.
**Option C:** This option is incorrect as it is not a known cause of Hunan hand. While certain metals may cause skin irritation, they are not specifically associated with this condition.
**Clinical Pearl / High-Yield Fact**
Hunan hand is often seen in individuals working with hexavalent chromium in industries such as electroplating or welding. It is essential for healthcare providers to be aware of this condition and its associated risk factors to provide proper diagnosis and treatment.
**Correct Answer: D. Hexavalent chromium (Cr6+).