This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Back and Thorax, Subject name: Anatomy
True about coronary sinus 
Select and explain. 
A. Lies in anterior pa of the coronary sulcus, B. Ends in right atrium, C. Has venae cordis minimae as its tributaries, D. Develops from right anterior cardinal vein
B: Ends in right atrium
Answer: B: Ends in right atrium 
Explanation: The coronary sinus is the largest vein of the hea. It is situated in the L. posterior coronary sulcus. Opens into the posterior wall of R. Atrium Tributaries: Great cardiac veins Middle cardiac vein Small cardiac vein Posterior vein of L. ventricle Oblique vein of L. atrium of marshal. R. marginal vein. It develops from the Left sinus venosus. venae cordis minimi or thebesian veins are small veins that open into the hea chambers directly.