The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A condition where there is loss of interdental bone on facial and lingual plate, without involvement of radicular bone is:   (A) Ledge   (B) Crater   (C) Intrabony defect   (D) Reverse architecture
['(D) Reverse architecture <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Ledge \n (B) Crater \n (C) Intrabony defect \n (D) Reverse architecture <> possible answers', '  A condition where there is loss of interdental bone on facial and lingual plate, without involvement of radicular bone is: <> context@']