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
Left sided superior vena cava drains into: 
Select and explain. 
A. Right Atrium, B. Left Atrium, C. Coronary sinus, D. Pericardial space
C: Coronary sinus
Answer: C: Coronary sinus 
Explanation: C i.e. Coronary sinus