  We demonstrate that the form factors of local operators between a heavy meson
state (like the~$B$) and a light pseudoscalar state (like the pion) are given
exactly by a single pole form in the combined heavy quark, large $N_c$ (number
of colors) and chiral limits. We discuss the deviations from this exact result
from finite heavy quark masses, non-zero light quark masses and finite $N_c$.
We comment on some implications of this result.
