This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Left common cardinal vein is reduced to \nSelect and explain. \nA. Great cardiac vein, B. Azygos vein, C. SVC, D. Coronary sinus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Left common cardinal vein is reduced to coronary sinus Ref Human embryology Inderbir singh Tenth edition Page 232', 'role': 'assistant'}]