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
Left common cardinal vein is reduced to 
Select and explain. 
A. Great cardiac vein, B. Azygos vein, C. SVC, D. Coronary sinus
D: Coronary sinus
Answer: D: Coronary sinus 
Explanation: Left common cardinal vein is reduced to coronary sinus Ref Human embryology Inderbir singh Tenth edition Page 232