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
[{'content': 'Middle cardiac vein is accompanied by \nSelect and explain. \nA. Anterior interventricular aery, B. Left circumflex aery, C. Posterior Interventricular aery, D. Diagonal aery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The middle cardiac vein commences at the apex of the hea; ascends in the posterior longitudinal sulcus along with posterior interventricular aery, and ends in the coronary sinus.Ref: V.S Volume 1; 2nd edition; Page: 276', 'role': 'assistant'}]