On the splitting fields of generic elements in Zariski dense subgroups

Let $G$ be a connected, absolutely almost simple, algebraic group defined over a finitely generated, infinite field $K$, and let $Γ$ be a Zariski dense subgroup of $G(K)$. We show, apart from some few exceptions, that the commensurability class of the field $\mathcal{F}$ given by the compositum of the splitting fields of characteristic polynomials of generic elements of $Γ$ determines the group $G$ upto isogeny over the algebraic closure of $K$.

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