Assertion: The concept of energy is central to Physics and its expression can be written for every physical system.
Reason: Law of conservation of energy is not valid for all forces and for any kind of transform ation between different forms of energy.
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.