Identify the fibre $(X)$ and elastomer $(Y)$ from the following:

• A

  $X$	$Y$
  Dacron	Neoprene

• B

  $X$	$Y$
  Novolac	Polystyrene

• C

  $X$	$Y$
  Teflon	Buna$-S$

• D

  $X$	$Y$
  Glyptal	Polypropene