This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematopoeisis: Basic concepts, Subject name: Pathology
[{'content': 'A primiparous D-negative (Rh-negative) mother has just delivered a D-positive child. Administration of which of the following substances would be indicated \nSelect and explain. \nA. Anti-D IgG to child, B. Anti-D IgG to mother, C. D-positive red cells to child, D. D-positive red cells to mother', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - Administration of anti-D antiserum to D-negative mother within 72hrs of delivery of D-positive child prevents maternal alloimmunization by removing fetal red cells from the maternal circulation.', 'role': 'assistant'}]