This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Disorders, Subject name: Pediatrics
[{'content': 'Hemolytic disease of new born is commonly due to incompatibility of which antigen? \nSelect and explain. \nA. C antigen in Rh group, B. D antigen in Rh group, C. E antigen in Rh group, D. Lewis antigen', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., D antigen in Rh group o Repeat from previous sessions", 'role': 'assistant'}]