Pick out the correct statements.
$I.$ Haemophilia is a sex-linked recessive disease
$II.$ Down's syndrome is due to aneuploidy
$III.$ Phenylketonuria is an autosomal dominant gene disorder
$IV.$ Phenylketonuria is an autosomal recessive gene disorder
$V.$ Sickle cell anaemia is an $X$-linked recessive gene disorder

• A
  $I, III$ and $V$ are correct
• B
  $I$ and $III$ are correct
• C
  $II$ and $V$ are correct
• D
  $I, II$ and $IV$ are correct