The following reaction takes place when aluminium powder is heated with $MnO_2$:
$3MnO_2(s) + 4Al(s) \rightarrow 3Mn(l) + 2Al_2O_3(l) + \text{Heat}$
$(a)$ Is aluminium getting reduced?
$(b)$ Is $MnO_2$ getting oxidised?

(N/A) No, aluminium is not getting reduced. Since oxygen is added to aluminium, it is getting oxidised to form aluminium oxide $(Al_2O_3)$.
$(b)$ No, $MnO_2$ is not getting oxidised. Since manganese has lost oxygen, $MnO_2$ is getting reduced to manganese $(Mn)$.