Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$ :
Assertion $A$ : Breast-feeding during the initial period of infant growth is recommended by doctors for bringing up a healthy baby.
Reason $R$ : Colostrum contains several antibodies absolutely essential to develop resistance in the newborn baby.
In the light of the above statements,choose the most appropriate answer from the options given below:

• A
  Both $A$ and $R$ are correct but $R$ is $NOT$ the correct explanation of $A$.
• B
  $A$ is correct but $R$ is not correct.
• C
  $A$ is not correct but $R$ is correct.
• D
  Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.