The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Frankfort - horizontal is a reference plane constructed by joining which of the following landmarks?   (A) Nasion and Sella   (B) Porion and Sella   (C) Porion and Nasion   (D) Porion and Orbitale
['(D) Porion and Orbitale <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Nasion and Sella \n (B) Porion and Sella \n (C) Porion and Nasion \n (D) Porion and Orbitale <> possible answers', '  Frankfort - horizontal is a reference plane constructed by joining which of the following landmarks? <> context@']