Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: $A$ solution of the product obtained by heating a mole of glycine with a mole of chlorine in the presence of red phosphorus generates a chiral carbon atom.
Reason $R$: $A$ molecule with $2$ chiral carbons is always optically active.
In the light of the above statements,choose the correct answer from the options given below:

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