This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital Infections, Subject name: Pediatrics
[{'content': 'Which of the following is true regarding congenital CMV infection? \nSelect and explain. \nA. Best sample for CMV PCR is blood, B. It is the most common cause of non-syndromic sensorineural hearing loss in children, C. All babies born are symptomatic, D. Breast feeding is contraindicated if the mother is CMV seropositive', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common infectious cause of congenital SNHL is CMV Diagnosed only by persistent presence of IgM antibody in first 2 weeks of life Congenital infection with CMV presents with symptoms in only 5- 10% of infected newborns In developing countries, most of the adults are already seropositive for CMV', 'role': 'assistant'}]