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
A primiparous D-negative (Rh-negative) mother has just delivered a D-positive child. Administration of which of the following substances would be indicated 
Select and explain. 
A. 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
B: Anti-D IgG to mother
Answer: B: Anti-D IgG to mother 
Explanation: - 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.