Niacin deficiency causes ?
**Core Concept**
Niacin, also known as **Vitamin B3**, is an essential nutrient that plays a crucial role in various metabolic processes. Its deficiency can lead to a range of clinical manifestations. Niacin is involved in the synthesis of **NAD+** and **NADP+**, which are vital for energy metabolism.
**Why the Correct Answer is Right**
The correct answer is related to the clinical condition known as **Pellagra**, which is characterized by the **three Ds**: diarrhea, dermatitis, and dementia. Niacin deficiency leads to a decrease in the synthesis of **NAD+** and **NADP+**, resulting in impaired energy metabolism and ultimately causing the symptoms of Pellagra.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not directly related to niacin deficiency.
**Option B:** This option is also incorrect as it is not a direct consequence of niacin deficiency.
**Option C:** This option is incorrect because it is not the primary condition caused by niacin deficiency.
**Option D:** This option is incorrect because it is not related to the clinical manifestations of niacin deficiency.
**Clinical Pearl / High-Yield Fact**
Niacin deficiency is a classic example of a nutritional disorder that can be prevented with a balanced diet. Pellagra is a significant clinical condition that can be treated with niacin supplementation.
**Correct Answer:** D. Pellagra.