This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Non-visualization of Gallbladder is a feature seen in case of Acute cholecystitis in which of the following investigations? \nSelect and explain. \nA. HIDA scan, B. USG abdomen, C. CECT abdomen, D. MRCP', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Acute cholecystitis on HIDA scan - failure to visualise gall bladder even after 60 min / delayed visualisation after 4 hrs', 'role': 'assistant'}]