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
Which of the following is the most common nonalcholic cause of acute pancreatitis - 
Select and explain. 
A. Thiazides, B. Hypercalcaemia, C. Hyperlipidaemia, D. Gall stones
D: Gall stones
Answer: D: Gall stones 
Explanation: Ans. is 'd' i.e., Gall stones