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': 'The interior of right atrium is partially divided into two parts by - \nSelect and explain. \nA. Crista terminalis, B. Musculi pectinati, C. Fossa ovalis, D. Sinus venarum cavarum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Right atrium is divided into rough anterior and smooth posterior parts by crista terminalis.', 'role': 'assistant'}]