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 among the following - 
Select and explain. 
A. Pancreatitis, B. Choledocholithiasis, C. Acute cholecystitis, D. All
D: All
Answer: D: All 
Explanation: Answer 'a' i.e. Pancreatitis; 'b' i.e. Choledocholithiasis; 'c' i.e. Acute cholecystitis