Which of the following vitamins is not fat-soluble?

The deficiency of vitamin $(X)$ causes convulsions. Source of $X$ is $Y$. What are $X$ and $Y$?

The correct order of match between column $X$ and column $Y$ is:

$X$	$Y$
$I$. Vitamin $A$	$i$. Muscular weakness
$II$. Vitamin $D$	$ii$. Increased blood clotting time
$III$. Vitamin $E$	$iii$. Night-blindness
$IV$. Vitamin $K$	$iv$. Osteomalacia

The deficiency of vitamin $x$ causes beri beri and deficiency of vitamin $y$ causes convulsions. What are $x$ and $y$ respectively?

Which vitamin deficiency causes the disease known as scurvy?

Write a note on vitamins.