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A trace element,also required for plant growth,and in the form of radioactive isotope useful in cancer therapy is

$\begin{array}{1 1}(A)\;\text{Iron}\\(B)\;\text{Calcium}\\(C)\;\text{Cobalt}\\(D)\;\text{Sodium}\end{array}$

A trace element,also required for plant growth,and in the form of radioactive isotope useful in cancer therapy is cobalt
Hence (C) is the correct answer.