This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genitourinary radiology, Subject name: Radiology
A patient presented with pain abdomen, X-Ray, AP view shows calcification on right side of abdomen. In lateral view calcification is seen to overlie the spine. What is the most likely diagnosis? 
Select and explain. 
A. Calcification in veebral sphenoid process, B. Calcified mesenteric nodes, C. Gall stone, D. Renal stone
D: Renal stone
Answer: D: Renal stone 
Explanation: Calcification on AP view in right side of abdomen and overlying the spine in lateral view points towards Renal stones( retroperitoneal). X-ray lumbar spine showing radio-opaque lesion in left paraveebral space which on lateral X-ray overlies with spine.