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
Oreo cookie sign is a radiological finding of 
Select and explain. 
A. Aberrant subclavian artery, B. Pericardial effusion, C. Left atrium enlargement, D. Endomyocardial fibrosis
B: Pericardial effusion
Answer: B: Pericardial effusion 
Explanation: Oreo - cookie sign - radioopaque pericardial fluid is borderd on either side by echo - dense pericardial fat.