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': 'Foramen ovale closes because of fusion of \nSelect and explain. \nA. Septum primerm + Endocardial cushion, B. Septam serunsum + Endocardial cushion, C. Septum primerm + Septam serunsum, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The septum primerm and septum secundum press againest each other close the communication (forman ovale) between the two arteria, complited at around 3 months after birth.', 'role': 'assistant'}]