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': 'This is an interventricular foramen through which lateral ventricles open into 3rd ventricle: \nSelect and explain. \nA. Foramen monro., B. Foramen of magendi., C. Foramen of luschka., D. Foramen caecum.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]