Biochemistry Vitamins and Minerals 59b5811e Which vitamin deficiency causes pellagra? A Vitamin B1 B Vitamin B2 C Vitamin B3 D Vitamin B4 High-Yield Explanation Ans. is 'c' i.e., Vitamin B3* Pellagra characterised by the three Ds - Diarrhoea, Dermatitis and Dementia is caused by niacin or vitamin B3 deficiency.