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 of the following test is done to differentiate between maternal and fetal blood in a case of fetomaternal hemorrhage? \nSelect and explain. \nA. Apt test, B. Kleihauer Betke test, C. Bubbling test, D. Lileystest', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Kleihauer - Betke test is an acid elution test used to detect fetal RBC in maternal circulation. This test gives a percentage of fetal RBC in maternal circulation and helps in estimating the extend of feto maternal hemorrhage. Fetal RBC contain HbF which is more resistant to acid elution than HbA. After exposure to acid only fetal Hb remains. Fetal red cells can then be identified by uptake of a special stain and quantified on peripheral smear.', 'role': 'assistant'}]