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: Forensic Medicine
Fetomaternal transfusion of fetal RBCs in mother can be detected by: UPSC 08; TN 08; AIIMS 10 
Select and explain. 
A. Direct Coomb's test, B. Betke-Kleihauer test, C. Electrophoresis, D. Indirect Coomb's test
B: Betke-Kleihauer test
Answer: B: Betke-Kleihauer test 
Explanation: Ans. Betke-Kleihauer test