Which of the following opens directly into right atrium?: (A) Anterior cardiac vein, (B) Oblique vein, (C) Middle cardiac vein, (D) Great cardiac vein
Answer is A. Following opens into right atrium
-        Superior vena cava
-        Inferior vena cava
-        Coronary sinus
-        Venae cordis minimae
-        Anterior cardiac vein
-        Right marginal vein