<prompt> A child has mid-crown fracture in a permanentmaxillary central incisor several months ago, the pulp is now necrotic, radiographic examination reveals an incompletely formed root with an open apex. The treatment of choice is:Formocresol pulpotomyRoot canal therapyCalcium hydroxide pulpotomyApexification  <response>: Apexification is the process of inducing the development of the root and the apical closure in an immature pulpless tooth with an open apex.The main aim of apexification is to preserve the Hertwigs root sheath and apical pulp tissue.Ref: Textbook of endodontics, Nisha Garg and Amit Garg, 3rd edition, pg no:548 