This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular Radiology, Subject name: Radiology
[{'content': 'On X-ray chest PA view, the anterior surface of the hea is formed by: \nSelect and explain. \nA. Right ventricle, B. Left ventricle, C. Right atrium, D. Left atrium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The Right ventricle forms the front of the hea with a contribution at its upper pa from the Right atrial appendage.', 'role': 'assistant'}]