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': 'Child with "Intracranial Calcification, Chorioretinitis" most appropriate cause is: \nSelect and explain. \nA. Toxoplasmosis, B. Herpes simplex, C. CMV, D. Syphilis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Toxoplasmosis', 'role': 'assistant'}]