Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$ :
Assertion $A$ : The $H-O-H$ bond angle in water molecule is $104.5^{\circ}$.
Reason $R$ : The lone pair $-$ lone pair repulsion of electrons is higher than the bond pair $-$ bond pair repulsion.

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