This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology in Relation to Reproduction, Subject name: Gynaecology & Obstetrics
Antibody to cross placenta 
Select and explain. 
A. IgA, B. IgG, C. IgE, D. IgM
B: IgG
Answer: B: IgG 
Explanation: Ans. (b) Ig GRef: Robbin's 9th ed. /198-199