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
The middle cardiac vein is located at the: 
Select and explain. 
A. Anterior interventricular sulcus, B. Posterior interventricular sulcus, C. Posterior AV groove, D. Anterior AV groove
B: Posterior interventricular sulcus
Answer: B: Posterior interventricular sulcus 
Explanation: B i.e. Posterior interventricular sulcus vein & posterior interventricular br. of right coronary aery is located in poster inter ventricular sulcus Q