Work done by friction in case of pure rolling

Work done by friction in pure rolling is always zero. Is this statement true or false?

Work done by friction in pure rolling is always zero. Is this statement true or false?

Assertion: When a solid sphere rolls down a sufficiently rough inclined surface then its mechanical energy remains constant. Reason: Work done by the friction in pure rolling is zero.

Work done by frictional force

Work done by frictional force

Work done by a frictional force is

Work done by a frictional force is

Work done by a frictional force is