The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Age of preoperational stage is   (A) 1-2 years   (B) 2-7 years   (C) 8-11 years   (D) 0-2 years
['(B) 2-7 years <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 1-2 years \n (B) 2-7 years \n (C) 8-11 years \n (D) 0-2 years <> possible answers', '  Age of preoperational stage is <> context@']