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Representative image for question: Which vitamin deficiency causes pellagra, classically presenting with dermatitis, diarrhea, and dementia?

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Health

Which vitamin deficiency causes pellagra, classically presenting with dermatitis, diarrhea, and dementia?

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Which vitamin deficiency causes pellagra, classically presenting with dermatitis, diarrhea, and dementia?

Options:

Vitamin B1 (thiamine)
Vitamin B3 (niacin)
Vitamin B6 (pyridoxine)
Vitamin C (ascorbic acid)

Correct answer: Vitamin B3 (niacin)

Explanation: Pellagra is caused by niacin (vitamin B3) deficiency and presents with the triad of dermatitis, diarrhea, and dementia; outbreaks occurred in the early 1900s in the U.S. South.

Created 2026-03-10T17:34:16.401Z. Updated 2026-03-10T17:34:16.401Z.

Which vitamin deficiency causes pellagra, classically pre... | QuestionStock