This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pregnancy in Rh-negative Women, Subject name: Gynaecology & Obstetrics
[{'content': "Which of the following test is used to estimate the amount of feto-maternal hemorrhage? \nSelect and explain. \nA. Coombs' test, B. Kleihauer Betke test, C. Lily's spectrophotometer, D. Schrill's test", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B. Kleihauer Betke testKleihauer-Betke test is used to estimate amount of fetal maternal hemorrhage. A maternal blood sample is treated with an acid-dilution procedure allowing identification of fetal blood cells. Comb's test prenatal detection of antibodies (Rh) in Rh negative mother as a screening test. Liley spectrophotometer is used in plotting amniotic fluid bilirubin in case of Rh sensitized mother after Amniocentesis. Shrill test:- Cervical biopsy test in suspected Ca cervix. Gram iodine is used as a Steiner. Healthy' tissue stains brown while carcinomatous are a remains unstained.", 'role': 'assistant'}]