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
[{'content': 'Which of the following is NOT affected in Rh isoimmunization? \nSelect and explain. \nA. Anti C, B. Anti E, C. Anti-Lewis, D. Anti D', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]