Bodies P, Q, R, S are labelled as having charges $Q_P=5\times10^{-19}\text{ C}$, $Q_Q=7\times10^{-19}\text{ C}$, $Q_R=1\times10^{-19}\text{ C}$, $Q_S=8\times10^{-19}\text{ C}$ respectively. Select the body having the correct charge. [Given electronic charge $e = 6\times10^{-19}\text{ C}$]}