This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
[{'content': 'The antigen lacking in Rh negative person is - \nSelect and explain. \nA. C, B. D, C. d, D. E', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The commonly used terms Rh factor, Rh positive and Rh negative refer to the D antigen only. Besides its role in blood transfusion, the D antigen is used to determine the risk of hemolytic disease of the newborn (or erythroblastosis fetalis) for Rh disease management.', 'role': 'assistant'}]