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
Foramen ovale closes because of fusion of - 
Select and explain. 
A. Septum primum + Endocardial cushion, B. Septum secundum + Endocardial cushion, C. Septum primum + Septum secundum, D. None
C: Septum primum + Septum secundum
Answer: C: Septum primum + Septum secundum 
Explanation: None