Which condition is primarily a consequence of niacin deficiency?

Pellagra is the condition that arises primarily from niacin deficiency. Niacin, also known as vitamin B3, is essential for several metabolic processes in the body, particularly in the conversion of food into energy and the maintenance of healthy skin, nerves, and digestive systems. The classic signs of pellagra include the "three D's": dermatitis, diarrhea, and dementia. If left untreated, it can lead to severe health complications.

While the other conditions listed are associated with deficiencies of different vitamins, they do not stem from a lack of niacin. Beriberi is related to a deficiency of thiamine (vitamin B1), ariboflavinosis is due to a lack of riboflavin (vitamin B2), and scurvy results from insufficient vitamin C. Understanding that each vitamin deficiency leads to distinct health issues is crucial in nutrition, highlighting the importance of a balanced diet that includes essential vitamins.