Pick out the correct statements.
$(1)$ Haemophilia is a sex-linked recessive disease.
$(2)$ Down's syndrome is due to aneuploidy.
$(3)$ Phenylketonuria is an autosomal recessive gene disorder.
$(4)$ Sickle cell anaemia is an $X$-linked recessive gene disorder.

• A
  $(1), (3)$ and $(4)$ are correct.
• B
  $(1), (2)$ and $(3)$ are correct.
• C
  $(1)$ and $(4)$ are correct.
• D
  $(2)$ and $(4)$ are correct.