The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Study models are used:   (A) As references in orthodontic cases   (B) To show shape, size and position of teeth   (C) As an aid in treatment planning   (D) All of the above
['(D) All of the above <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) As references in orthodontic cases \n (B) To show shape, size and position of teeth \n (C) As an aid in treatment planning \n (D) All of the above <> possible answers', '  Study models are used: <> context@']