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': 'Right heart border is formed by all except – \nSelect and explain. \nA. SVC, B. IVC, C. Right atrium, D. Left atrium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]