Deb packages dependent tree

["pavel.orehov@gmail.com" <pavel.orehov@gmail.com>]

Hi,

Is there is a simple way to get all deb packages that on dependent tree
of some deb package.

For example i have deb package A that depends of package B and C. And B
depends of D.
I want to run some command on A and get B, C, D.

Thanks,
Pavel