Which classical vitamin deficiency is known for the four Ds: dermatitis,dementia,diarrhea,and death?

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The classical vitamin deficiency known for the four Ds is niacin deficiency, also known as pellagra. Niacin is an essential nutrient that is involved in energy metabolism and DNA repair. Symptoms of pellagra include a scaly rash on sun-exposed skin, dementia, diarrhea, and eventually death if left untreated. Thiamin deficiency can lead to a condition called beriberi, which is characterized by muscle weakness, nerve degeneration, and heart failure. Biotin deficiency is rare but can lead to skin rash, hair loss, and neurological symptoms. Folic acid deficiency can lead to anemia, birth defects, and cognitive impairment, but it is not associated with the four Ds.

Which Classical Vitamin Deficiency Is Known for the Four Ds