Which one of the following is $CORRECT$ regarding struvite stones in kidney?
$I$. These are formed in response to bacterial infection.
$II$. It is a genetic disorder.
$III$. These grow quickly and become quite large.
$IV$. Occurs in people who consume high protein diet.
$V$. Affected people excrete too much of certain amino acid.

• A
  $II$ and $III$ only
• B
  $III$ and $IV$ only
• C
  $I$ and $III$ only
• D
  $IV$ and $V$ only