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
Chest Radiograph and Abdominal CT scan of a middle aged male complaining of nagging abdominal pain for the past 2 weeks is given,what is the probable diagnosis? 
Select and explain. 
A. Porcelain Gall Bladder, B. Hydatid Cyst, C. Pyogenic Liver Abscess, D. Amoebic liver Abscess
B: Hydatid Cyst
Answer: B: Hydatid Cyst 
Explanation: Calcified Ring like shadow in the region of Liver on Chest Radiograph and the CT scan showing mural calcification is suggestive of Hydatid Cyst and is due to calcification of the Pericyst.