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
This is an interventricular foramen through which lateral ventricles open into 3rd ventricle: 
Select and explain. 
A. Foramen monro., B. Foramen of magendi., C. Foramen of luschka., D. Foramen caecum.
A: Foramen monro.
Answer: A: Foramen monro. 
Explanation: None