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
[{'content': 'Triangle of Koch is not formed by \nSelect and explain. \nA. Limbus of Fossa ovalis, B. Tendon of Todaro, C. Coronary sinus, D. Septal Cusp of Tricuspid valve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Triangle of Koch is formed by\n\nTendon of Todaro\nCoronary sinus\nSeptal Cusp of Tricuspid valve', 'role': 'assistant'}]