Vitamin $B_{6}$ is known as

At what temperature is the density of water maximum (in $^\circ \text{C}$)?

Choose the correct option ($T$-true,$F$-false).
$(I)$ Melting point of oil is lower.
$(II)$ All amino acids are acidic.
$(III)$ Lipid is water soluble.
$(IV)$ Enzyme shows its highest activity at a particular temperature.
$I - II - III - IV$

Which match is true?

Match the following columns:

Column-$I$	Column-$II$
$(A)$ Disaccharide	$(i)$ Unsaturated fatty acid
$(B)$ Galactose	$(ii)$ Saturated fatty acid
$(C)$ Oleic acid	$(iii)$ Monosaccharide
$(D)$ Stearic acid	$(iv)$ Monosaccharide pair

Deficiency of which of the following leads to dermatitis,diarrhea,and dementia?