The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Fourth generation apex locater based on   (A) Resistance   (B) lmpedence   (C) Frequency   (D) Multiple frequency ratio
['(D) Multiple frequency ratio <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Resistance \n (B) lmpedence \n (C) Frequency \n (D) Multiple frequency ratio <> possible answers', '  Fourth generation apex locater based on <> context@']