Choose the correct option for the given descriptions:
$(i)$ The heterozygous female transmits the disease to the son.
$(ii)$ Change in the shape of the $RBC$ from biconcave disc to elongated sickle-like structure.
$(iii)$ Mentally retarded.
$(iv)$ Haemoglobin is not formed in the proper amount in the blood.

• A
  Colour blindness,thalassaemia,phenylketonuria,anaemia.
• B
  Haemophilia,sickle cell anaemia,Klinefelter's syndrome,thalassaemia.
• C
  Down's syndrome,Klinefelter's syndrome,colour blindness,Turner's syndrome.
• D
  Haemophilia,sickle cell anaemia,phenylketonuria,thalassaemia.