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
Which of the following is true regarding congenital CMV infection? 
Select and explain. 
A. 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
B: It is the most common cause of non-syndromic sensorineural hearing loss in children
Answer: B: It is the most common cause of non-syndromic sensorineural hearing loss in children 
Explanation: 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