For what value of $k$ will the equation $kx^2-5x+k=0$ have equal roots?

Question

$\begin{array}{1 1}(A) \; \large\frac{5}{2}\\(B)\;\large\frac{-5}{2} \\(C)\;\pm\large\frac{5}{2} \\(D)\;\text{None of these} \end{array}$