The following are multiple choice questions (with answers) about medical knowledge.   **Question:** In fixed orthodontic treatment, how much force is needed for intrusion of four mandibular anterior teeth:   (A) 50 gm   (B) 100gm   (C) 150gm   (D) 200gm
['(A) 50 gm <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 50 gm \n (B) 100gm \n (C) 150gm \n (D) 200gm <> possible answers', '  In fixed orthodontic treatment, how much force is needed for intrusion of four mandibular anterior teeth: <> context@']