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
Periventricular calcification is often due to: 
Select and explain. 
A. Toxoplasmosis, B. Cytomegalic infection, C. Congenital syphilis, D. All of the above
B: Cytomegalic infection
Answer: B: Cytomegalic infection 
Explanation: B i.e. Cytomegalovirus