input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 53-year-old man comes to the physician because of a 2-month history of multiple episodes of small amounts of blood in his stools. Examination shows pale conjunctivae. His hemoglobin concentration is 8.3 g/dL and mean corpuscular volume is 72μm3. Colonoscopy shows a 2.3-cm polypoid mass in the ascending colon. A photomicrograph of a biopsy specimen of the lesion is shown. Which of the following processes is most likely to be involved in the pathogenesis of this patient's condition?   (A) Underexpression of COX-2   (B) Increased phosphorylation of serine and threonine   (C) Impaired degradation of β-catenin   (D) Abnormal transfer of phosphate to cellular proteins
output: ['(C) Impaired degradation of β-catenin <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Underexpression of COX-2  (B) Increased phosphorylation of serine and threonine  (C) Impaired degradation of β-catenin  (D) Abnormal transfer of phosphate to cellular proteins <> possible answers', "  A 53-year-old man comes to the physician because of a 2-month history of multiple episodes of small amounts of blood in his stools. Examination shows pale conjunctivae. His hemoglobin concentration is 8.3 g/dL and mean corpuscular volume is 72μm3. Colonoscopy shows a 2.3-cm polypoid mass in the ascending colon. A photomicrograph of a biopsy specimen of the lesion is shown. Which of the following processes is most likely to be involved in the pathogenesis of this patient's condition? <> context"]