In the balanced redox reaction $MnO_4^- + xFe^{2+} + yH^+ \rightarrow Mn^{2+} + 5Fe^{3+} + 4H_2O$,what are the values of $x$ and $y$?
- A$2$ and $16$
- B$16$ and $2$
- C$8$ and $16$
- D$5$ and $2$
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