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': "Koch's triangle has blood supply from \nSelect and explain. \nA. Right coronary, B. Left circumflex, C. Left anterior descending, D. Anterior aoic sinus", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Koch&;s triangle has blood supply from Right coronary', 'role': 'assistant'}]