Assertion : The resistance of super-conductor is zero.
Reason : The super-conductors are used for the transmission of electric power.

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 true

Answer

B

Explanation

Resistance of superconductor falls to zero at critical temperature.
This property is very useful for power transmission without any loss.
Assertion and reason both are true but reason does not explain the assertion.