Match the items in Column $\mathrm{I}$ with its main use listed in Column$\mathrm{II}$:
 

	Column$\mathrm{I}$		Column$\mathrm{II}$
$\mathrm{A}$	Silica gel	$\mathrm{i}.$	Transistor
$\mathrm{B}$	Silicon	$\mathrm{ii}.$	Ion-exchanger
$\mathrm{C}$	Silicone	$\mathrm{iii}.$	Drying agent
$\mathrm{D}$	Silicate	$\mathrm{iv}.$	Sealant

• Correct answer
  A

  $\mathrm{A} - \mathrm{iii}, \mathrm{B} - \mathrm{i}, \mathrm{C} - \mathrm{iv}, \mathrm{D} -\mathrm{ii}$
• B

  $\mathrm{A} - \mathrm{iv}, \mathrm{B} - \mathrm{i}, \mathrm{C} - \mathrm{ii}, \mathrm{D} - \mathrm{iii}$
• C

  $\mathrm{A} - \mathrm{ii}, \mathrm{B} - \mathrm{i}, \mathrm{C} - \mathrm{iv}, \mathrm{D} - \mathrm{iii}$
• D

  $\mathrm{A} - \mathrm{ii}, \mathrm{B} - \mathrm{iv}, \mathrm{C} - \mathrm{i}, \mathrm{D} - \mathrm{iii}$

Hence, the correct answer is option: 'A'.