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: Radiology
[{'content': 'Periventricular calcification is often due to - \nSelect and explain. \nA. Toxoplasmosis, B. CMV infection, C. Congenital syphilis, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Periventricular calcification is seen in CMV infection.', 'role': 'assistant'}]