Consider the following vision defects listed in Columns I and II and the corrective measures in Column III. Choose the correct combination.

	$\mathrm{Column} \mathrm{I}$		$\mathrm{Column} \mathrm{II}$		$\mathrm{Column} \mathrm{III}$
P.	Hypermetropia	$\left(\mathrm{i}\right)$	Near-sightedness	a.	Convex lens
Q.	Myopia	$\left(\mathrm{i}\right)$	Far-sightedness	b.	Concave lens

• A

  $P\mathit{-}ii\mathit{-}b$
• Correct answer
  B

  $Q-i-b$
• C

  $P\mathit{-}i\mathit{-}a$
• D

  $Q-i-a$

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