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: Radiology
Thickened gall bladder wall in USG seen in? 
Select and explain. 
A. Acute cholecystitis, B. Mucosal thickening, C. Cholesterosis, D. All
D: All
Answer: D: All 
Explanation: A i.e. Acute cholecystitis; B i.e. Mucosal thickening; C i.e. Cholesterosis