This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: RH Incompatibility, Subject name: Gynaecology & Obstetrics
A 3rd gravida with normal previous 2 pregnancies. Best test to diagnose Rh sensitization in Rh -ve mother is 
Select and explain. 
A. Direct Coombs' test, B. 'C' Antigen, C. Indirect Coombs' test, D. 'O 'Antigen
C: Indirect Coombs' test
Answer: C: Indirect Coombs' test 
Explanation: In all cases of Rh-negative women irrespective of blood grouping and parity, albumin antibody is detected by indirect Coombs' test.