input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Inflammation of the periapical tissue is sustained by:   (A) Stagnant tissue fluid   (B) Necrotic tissue   (C) Microorganisms   (D) Pus cells
output: ['(C) Microorganisms <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Stagnant tissue fluid  (B) Necrotic tissue  (C) Microorganisms  (D) Pus cells <> possible answers', '  Inflammation of the periapical tissue is sustained by: <> context']