This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatobiliary radiology, Subject name: Radiology
[{'content': 'Best investigation to diagnose a hydatid cyst in liver is- \nSelect and explain. \nA. Ultrasound, B. CT-scan, C. MRI, D. MRCP', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Best investigation to diagnose a hydatid cyst in liver is: CECT scan', 'role': 'assistant'}]