This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'Left sided superior vena cava drains into \nSelect and explain. \nA. Right atrium, B. Left atriurm, C. Coronary sinus, D. Pericardial space', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Persistent left superior vena cava (PLSVC) is the most common variation of the thoracic venous system left sided svc drains into right atrium coronary sinus . <img src=" /> Image ref - researchate.net', 'role': 'assistant'}]