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
Feto maternal transfusion is detected by : 
Select and explain. 
A. Kleihauer test, B. Spectrophotometry, C. Benzidine test, D. None of the above
A: Kleihauer test
Answer: A: Kleihauer test 
Explanation: Kleihauer test