The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The optimal time to employ an orthodontic appliance that takes advantage of growth is during:   (A) Late mixed dentition   (B) Early mixed dentition   (C) Late primary dentition   (D) Early permanent dentition
['(A) Late mixed dentition <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Late mixed dentition \n (B) Early mixed dentition \n (C) Late primary dentition \n (D) Early permanent dentition <> possible answers', '  The optimal time to employ an orthodontic appliance that takes advantage of growth is during: <> context@']