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': 'Left sided superior vena cava drains into: \nSelect and explain. \nA. Right Atrium, B. Left Atrium, C. Coronary sinus, D. Pericardial space', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Coronary sinus', 'role': 'assistant'}]