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If G is a finite nilpotent group, then every minimal normal subgroup of $G$ is contained in the center of $G$ and has prime order.

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    First, the minimal normal subgroup is a abelian p-group, consider the intersection of the minimal normal subgroup and the commutator subgroup of G is the identity.2010-11-08

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A finite nilpotent group is a product of $p$-groups. So you can do a very quick computation to show that you can reduce to the case where $G$ is a $p$-group.

Then look at this question to answer Steve D's comment query.

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    @Steve D: Agreed.2010-11-08