Read the following statements and choose the correct one.
A. Vitamin K is naphthoquinone derivative.
B. The condition of vitamin deficiency is known as pellagra.
C. Pantothenic acid is pyridine derivative.
D. The deficiency of vitamin E causes beriberi.

The correct option is B A
(A) Vitamin K is naphthoquinone derivative. It contains isoprene units. Thus, statement A is correct.
(B) Pellagra is a vitamin deficiency disease, most frequently caused by a lack of vitamin $B_5$. It affects the pigmentation of the skin. Since, it is particular to one or two vitamins, the option B is incorrect.
(C) Pantothenic acid is not a pyridine derivative. It is open chain compound. Thus, the statement C is incorrect.
(D) The deficiency of vitamin $B_1$ causes beriberi. Thus, the option D is correct.