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: Unknown
Foramen of Magendie is the central opening of - 
Select and explain. 
A. Lateral ventricle, B. 4th ventricle, C. 3rd ventricle, D. None
B: 4th ventricle
Answer: B: 4th ventricle 
Explanation: Ans-B