input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 60-year-old chronic smoker presented with progres-sive jaundice, pruritus and clay colored stools for 2 months. History of waxing and waning of jaundice was present. A CT scan revealed dilated main pancre-atic duct and common bile duct. What is the likely di-agnosis?   (A) Carcinoma head of pancreas   (B) Periampullary carcinoma   (C) Chronic pancreatitis   (D) H lar cholangiocarcinoma
output: ['(B) Periampullary carcinoma <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Carcinoma head of pancreas  (B) Periampullary carcinoma  (C) Chronic pancreatitis  (D) H lar cholangiocarcinoma <> possible answers', '  A 60-year-old chronic smoker presented with progres-sive jaundice, pruritus and clay colored stools for 2 months. History of waxing and waning of jaundice was present. A CT scan revealed dilated main pancre-atic duct and common bile duct. What is the likely di-agnosis? <> context']