<prompt> Pellagra is caused by deficiency of which vitamin?B2B3B1Folic acid  <response>: Niacin Vit B3 or nicotinic acid is also known as pellagra preventive P.P. factor of Goldberg Pellagra Photosensitive Dermatitis: Symmetric dermatitis in the sun-exposed areas Casals Necklace The rash form a ring around the neck 4 Ds of Pellagra Dermatitis Photosensitive Dermatitis Dementia Diarrhoea Death ref DM Vasudevan 8th ed page 470 