input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The first radiographic sign of chronic pulpal infection of primary molars is:   (A) Periapical bony changes   (B) Root resorption   (C) Changes in bony furcation area   (D) Widening of apical periodontal ligament
output: ['(C) Changes in bony furcation area <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Periapical bony changes  (B) Root resorption  (C) Changes in bony furcation area  (D) Widening of apical periodontal ligament <> possible answers', '  The first radiographic sign of chronic pulpal infection of primary molars is: <> context']