Answerable for — the one a duty comes home to; ownership's ethical face.
Built on respond, from Latin respondere (to answer, to pledge in return): re- (back) + spondere (to pledge); to be responsible is to be the one a pledge comes home to, answerable when it is called on.
Answerable for — the one a duty comes home to. The root's pledging is ownership's ethical face: a promise made means someone stays reachable when it is time to answer for it.