The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Calcification of roots of deciduous teeth is completed by:   (A) 2 years   (B) 4 years   (C) 6 years   (D) 8 years
['(B) 4 years <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 2 years \n (B) 4 years \n (C) 6 years \n (D) 8 years <> possible answers', '  Calcification of roots of deciduous teeth is completed by: <> context@']