This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Gallbladder and Extrahepatic Biliary Tract, Subject name: Pathology
The complications of gallstones include all of the following except: 
Select and explain. 
A. Adenocarcinoma of ampulla of Vater, B. Acute intrahepatic cholangitis, C. Acute pancreatitis, D. Gangrenous cholecystitis
A: Adenocarcinoma of ampulla of Vater
Answer: A: Adenocarcinoma of ampulla of Vater 
Explanation: Ans (a) Adenocarcinoma of ampulla of VaterThe complications of gallstones include gangrenous cholecystitis by pressure on the mucosa and blood vessels in an acutely inflamed gallbladder* Cholangitis by blocking the major biliary ducts and allowing bacteria to ascend into the liver* Obstructive jaundice by blocking the common duct* Acute pancreatitis by blocking the ampulla of Vater or a major pancreatic duct* Gallstone ileus.