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
[{'content': 'Characterstic X Ray finding in ASD is: \nSelect and explain. \nA. Enlarged left ventricle, B. Enlarged left atria, C. Pulmonary pletheora, D. PAH', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Pulmonary plethora', 'role': 'assistant'}]