A 55-year-old woman presents with painless jaundice, pale stools, and dark urine. Imaging reveals a dilated common bile duct with a distal obstruction. What is the most likely diagnosis? a) Cholecystitis b) Choledocholithiasis c) Cholangiocarcinoma d) Acute pancreatitis Answer: c) Cholangiocarcinoma Explanation: This patient's presentation of painless jaundice, pale stools, dark urine, and imaging findings of a dilated common bile duct with a distal obstruction is highly suggestive of cholangiocarcinoma.
