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: Medicine
[{'content': 'Waiting chamber of heart is: \nSelect and explain. \nA. Left ventricle, B. Right ventricle, C. Right auricle, D. Left auricle', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]