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 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 REF: Fernando arias 3' e p. 359-360 The Lewis antigen doesn't cause erythroblastosis fetalis and differs from all other antigens that they are not synthesized in RBC membrane, but absorbed into it.", 'role': 'assistant'}]