All the following are uses of amniocentesis, but one is misuse. Which one is misuse?

• A

  The centres for genetic counselling offer amniocentesis on request to women for chromosome analysis

• B

  This technique has been developed for detecting foetal abnormalities by analysing chromosomal defects

• C

  It is used to study metabolic defects of foetus like $PKU$ (phenyl ketonuria)

• D

  It is done to examine the sex of the foetus leading to increasing female foeticides