This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
Acalculous cholecystitis is seen in 
Select and explain. 
A. Patients recovering from major surgery, B. Trauma, C. Burns, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Acalculous cholecystitis is common in critically ill patients due to bile stasis and ischaemia.It is common in patients who have undergone major surgeries,trauma,burns,or any other stress or in cases of cholecystosis.Patients who are on prolonged total parenteral nutrition,atherosclerosis,etc are highly prone for acalculous cholecystitis.Reference:SRB's manual of surgery,5th edition,page no:645.