Which of the following polymers contains an amide linkage?

Which of the following is not true?

Match List-$I$ with List-$II$

List-$I$ (Polymers)	List-$II$ (Commercial names)
$A$. Phenol-formaldehyde resin	$I$. Glyptal
$B$. Copolymer of $1,3$-butadiene and styrene	$II$. Novolac
$C$. Polyester of glycol and phthalic acid	$III$. Buna-$S$
$D$. Polyester of glycol and terephthalic acid	$IV$. Dacron

Choose the correct answer from the options given below.

The polydispersity index $(PDI)$ of a polymer is ($\bar{M}_w = \text{weight average molecular mass}$ and $\bar{M}_n = \text{number average molecular mass}$)

Bulletproof helmets are made from -

Perlon is ........ .