Recursion Quiz Question

Only recursively defined functions can be implemented recursively.
It is a True statement from quiz. How can this be justified, i cannot think of anyhting apart from recursion that can be carried out recursively

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By definition, a recursively defined function is one that calls itself or uses its previous term for subsequent terms. There are functions/problems whose definition is not recursive but they contain a subproblem and hence can be redefined recursively and hence implemented recursively.