Deficiency of vitamin B1 causes a condition known as , and this leads to .

Q. Deficiency of vitamin $B_1$, leads to

Q. Deficiency of Vitamin D can cause a condition known as , which can result in .

Q. Vitamin A deficiency leads to a disease known as:

Q. 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.

Q. Synthesis of thyroxine needs , and its deficiency leads to a condition known as .