The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following is true about Catlan's appliance?   (A) It is used to treat cross-bite of maxillary posterior teeth   (B) It is constructed on the lower anterior teeth with an inclined plane   (C) If used for a long period it results in anterior deep bite   (D) Of constructed on the upper anterior teeth it has a 45 degree angulation
['(B) It is constructed on the lower anterior teeth with an inclined plane <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) It is used to treat cross-bite of maxillary posterior teeth \n (B) It is constructed on the lower anterior teeth with an inclined plane \n (C) If used for a long period it results in anterior deep bite \n (D) Of constructed on the upper anterior teeth it has a 45 degree angulation <> possible answers', "  Which of the following is true about Catlan's appliance? <> context@"]