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 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 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.