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
Maternal Antibody responsible for heartblock in a baby born to mother suffering from SLE 
Select and explain. 
A. Anti-La antibody, B. Anti-dsDNA antibody, C. Anti-Ro antibody, D. Anti-La antibody
C: Anti-Ro antibody
Answer: C: Anti-Ro antibody 
Explanation: Anti-Ro antibody crosses placenta and affects conducting system of fetal heart leading to Heart block.