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: Pediatrics
[{'content': 'Which of the following is the most common congenital viral infection ? \nSelect and explain. \nA. Rubella, B. Cytomegalovirus, C. Herpes simplex, D. REV', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]