Answer
The corresponding baryon is a neutron $n$
Work Step by Step
The down quark $d$ has strangeness $0$, charge $-\frac{1}{3}$, and baryon number $+\frac{1}{3}$
The up quark $u$ has strangeness $0$, charge $+\frac{2}{3}$, and baryon number $+\frac{1}{3}$
The quark bundle $ddu$ has net strangeness $0$, net charge $0$, and net baryon number $+1$
The corresponding baryon is a neutron $n$
