The example of non ohmic resistance is

Explanation: 

Ohm's law states that the current flowing through a conductor is directly proportional to the potential difference applied actress its ends provided the temperature and other parameters remain unchanged 

V ∝I

VI=R

The conductors which do not obey ohm’s law are called non ohmic conductors. The resistance of such conductors is not constant even at a given temperature , rather it is current dependent.

Examples of non ohmic conductors are: p-n junction diode, water voltameter , thyristor, gallium arsenide.

Final answer: 

Option (A) i.e., diode