Home ยป Which of the following diseases is caused by the deficiency of Niacin? Vitamins MCQs Which of the following diseases is caused by the deficiency of Niacin? January 26, 2022 6 Views Q. Which of the following diseases is caused by the deficiency of Niacin? A. Scurvy B. Rickets C. Pellagra D. Pernicious anaemia Answer: Pellagra.