<prompt> The disease which is characterized by three Ds-- diarrhea, dermatitis and dementia is due to deficiency of?Vitamin ANiacinFolateVitamin C  <response>: b. NiacinRef: Nelsons 20c p 324, Ghai 8e p 118Diarrhea, Dermatitis Dementia are seen in Pellagra, which is due to Niacin deficiency. 