The following are multiple choice questions (with answers) about medical knowledge.   **Question:** According to piagets, the period of pre operational stage is:   (A) Birth to 18 months   (B) 12 years onwards.   (C) 2-6 years.   (D) 7-12 years.
['(C) 2-6 years. <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Birth to 18 months \n (B) 12 years onwards. \n (C) 2-6 years. \n (D) 7-12 years. <> possible answers', '  According to piagets, the period of pre operational stage is: <> context@']