This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Which of the following is NOT affected in Rh isoimmunization? 
Select and explain. 
A. Anti C, B. Anti E, C. Anti-Lewis, D. Anti D
C: Anti-Lewis
Answer: C: Anti-Lewis 
Explanation: Anti-Lewis and anti-I antibodies are not associated with fetal hemolytic disease. It differs from all other antigens in that they are not synthesized in RBC membrane, but absorbed into it. Ref: Obstetrics and Gynecology By Charles R. B. Beckmann, American College of Obstetricians and Gynecologists, 2010, Page 197.