Answer:
Pellagra: Vitamin B3
Scurvy: Vitamin C
Explanation:
Pellagra is a disease produced by low levels of Niacin (Vitamin B3). It can either happen because of malnutrition (Primary cause) or malabsorption (Secondary cause). The symptoms are known as the 3 D's: Diarrhea, Dementia, and Dermatitis. It is treated with dietary changes or dietary supplements.
Scurvy is a Vitamin C defficiency, it is treated with oral or IV vitamin C supplements. The symptoms include anemia, weakness, gum or skin problems. If it is left untreated it can be fatal.
