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
All of the following open into right atrium except 
Select and explain. 
A. Anterior cardiac vein, B. Venae cordis minimi, C. Coronary sinus, D. Middle cardiac vein
D: Middle cardiac vein
Answer: D: Middle cardiac vein 
Explanation: Middle cardiac vein accompanies the posterior interventricular aery and joins the middle pa of coronary sinus B D CHAURASIA'S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME 1 SIXTH EDITION Page no:255,267