Match the following columns:

Column-$I$	Column-$II$
$a. PCT$	$i. \text{Selective secretion of } H^+ \text{ and } K^+ \text{ ions}$
$b. DCT$	$ii. 70-80\% \text{ of electrolytes and water reabsorption}$
$c. \text{Descending limb}$	$iii. \text{Allows passage of small amounts of urea}$
$d. \text{Ascending limb}$	$iv. \text{Permeable to water}$
$e. \text{Collecting duct}$	$v. \text{Permeable to salts}$

• A
  $a-i, b-ii, c-iii, d-iv, e-v$
• B
  $a-i, b-iii, c-iv, d-ii, e-v$
• C
  $a-ii, b-i, c-iv, d-v, e-iii$
• D
  $a-ii, b-i, c-v, d-iv, e-iii$