<prompt> To achieve the objectives of vertical condensation, it is necessary to produce:A cylindrical canalA conical canalA tapering conical canalA straight canal  <response>: The root canal preparation should develop a continuously tapering cone. This shape mimics the natural canal shape. Funnel-shaped preparation of canal should merge with the access cavity so that instruments will slide into the canal. Thus, the access cavity and root canal preparation should form a continuous channel.Textbook of endodontics, 3rd edition Nisha Garg, Amit Garg 