A pair of dice is rolled together till a sum of either 5 or 7 is obtained. The probability that 5 comes before 7 is

Question

$\begin {array} {1 1} (A)\;\large\frac{2}{5} & \quad (B)\;\large\frac{1}{5} \\ (C)\;\large\frac{3}{5} & \quad (D)\;None\: of \: these \end {array}$