Assertion: Polar molecules do not have permanent dipole moment.
Reason: In polar molecules, the centre of positive and negative charges coincides even when there is no external field.
Options:
(a) Both A and R are true and R is the correct explanation of A.
(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) A is false and R is also false.