Prevalent among U.S. Southerners during the early 1900s, pellagra was first thought to be an infectious disease. Today we know that it is caused by a deficiency of
A. vitamin A.
B. vitamin C.
C. protein.
D. niacin.
Answer:D
Prevalent among U.S. Southerners during the early 1900s, pellagra was first thought to be an infectious disease. Today we know that it is caused by a deficiency of
A. vitamin A. B. vitamin C. C. protein. D. niacin.