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