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
Egg on side appearance in chest x-ray is seen in 
Select and explain. 
A. TGA, B. TAPVC, C. Constrictive pericarditis, D. TDF
A: TGA
Answer: A: TGA 
Explanation: Egg on side - Uncorrected TGA.
Egg in cup - Constrictive pericarditis.