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: Anatomy
[{'content': 'Base of the hea is formed by ? \nSelect and explain. \nA. Right atrium, B. Right ventricle, C. Left atrium, D. Left ventricle', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is `c > a' i.e., Left atrium > Right atrium", 'role': 'assistant'}]