The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Non radiographic method of working length determination:   (A) Digital tactile sense   (B) Apical periodontal sensitivity   (C) Electronic apex locator   (D) All of the above
['(D) All of the above <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Digital tactile sense \n (B) Apical periodontal sensitivity \n (C) Electronic apex locator \n (D) All of the above <> possible answers', '  Non radiographic method of working length determination: <> context@']