The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Deciduous teeth do not show fluorosis because:   (A) Placenta acts as a barrier   (B) Fluoride is taken up by the fast growing skeletal tissue   (C) The calcification time of deciduous teeth is less   (D) All of the above
['(D) All of the above <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Placenta acts as a barrier \n (B) Fluoride is taken up by the fast growing skeletal tissue \n (C) The calcification time of deciduous teeth is less \n (D) All of the above <> possible answers', '  Deciduous teeth do not show fluorosis because: <> context@']