  Inspired by a large decay branching ratio (BR) of $B^{+}\to f_{0}(980)K^{+}$
measured by Belle recently, we propose that a significant evidence of the
component of $n\bar{n}=(u\bar{u}+d\bar{d})/\sqrt{2}$ in $f_{0}(980)$ could be
demonstrated in exclusive $b\to c$ decays by the observation of $f_{0}(980)$ in
the final states $\bar{B}\to D^{0(*)} \pi^{+} \pi^{-}(KK)$ and $\bar{B}\to
J/\Psi \pi^{+} \pi^{-}(KK)$. We predict the BRs of $\bar{B}\to D^{0(*)}
(J/\Psi) f_{0}(980)$ to be ${\cal {O}}(10^{-4})$ (${\cal {O}}(10^{-5})$) while
the unknown wave functions of $D^{(*)0}$ ($J/\Psi$) are chosen to fit the
observed decays of $\bar{B}\to D^{(*)0} \pi^{0} (J/\Psi K^{0(*)})$.
