input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Investigation of choice for diagnosis of Zenker's diveiculum is:   (A) CECT   (B) Endoscopy   (C) Esophageal manometry   (D) Barium swallow
output: ['(D) Barium swallow <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) CECT  (B) Endoscopy  (C) Esophageal manometry  (D) Barium swallow <> possible answers', "  Investigation of choice for diagnosis of Zenker's diveiculum is: <> context"]