Which vitamin deficiency is linked to pellagra?

Pellagra is specifically linked to a deficiency in niacin, also known as vitamin B3. Niacin is essential for the body as it plays a crucial role in energy metabolism and is involved in the synthesis of various enzymes important for cellular functions. The symptoms of pellagra include dermatitis, diarrhea, dementia, and, if left untreated, can lead to death. These symptoms reflect the critical roles that niacin plays in maintaining healthy skin, supporting digestive health, and ensuring proper neurological function.

Deficiencies in other vitamins mentioned, such as vitamin A, D, or C, lead to different health issues. For example, vitamin A deficiency can cause vision problems; vitamin D deficiency is associated with bone health and can lead to conditions such as rickets or osteomalacia; and vitamin C deficiency results in scurvy, characterized by symptoms like gum disease and fatigue. Understanding the specific deficiencies associated with each vitamin clarifies why niacin is the correct answer in the context of pellagra.