input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** With aging changes in periodontal ligament are   (A) Decrease in number of cells and increase in collagen fibers   (B) Increase in number of cells and decrease in collagen fibers   (C) Increase in number of elastic fibers   (D) Hyalinisation changes
output: ['(C) Increase in number of elastic fibers <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Decrease in number of cells and increase in collagen fibers  (B) Increase in number of cells and decrease in collagen fibers  (C) Increase in number of elastic fibers  (D) Hyalinisation changes <> possible answers', '  With aging changes in periodontal ligament are <> context']