This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Gallstones may be complicated by which of the following? 1. Pancreatitis 2. Choledocholithisasis 3. Acute cholecystitis 4. Carcinoma stomach 5. Carcinoma pancreas 
Select and explain. 
A. 1,2 & 3, B. 2,3 & 4, C. 1,3 & 5, D. 2,3 & 5
A: 1,2 & 3
Answer: A: 1,2 & 3 
Explanation: Effects and complications of gallbladder stones are: In Gallbladder In Bile ducts In the intestine Silent stone Acute cholecystitis Chronic cholecystitis Mucocele Empyema Perforation Gangrene Carcinoma Obstructive jaundice Cholangitis Acute pancreatitis Acute intestinal obstruction (Gallstone ileus) Ref: Bailey & Love 25/e, Page 1120.