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': 'Feto maternal transfusion is detected by : \nSelect and explain. \nA. Kleihauer test, B. Spectrophotometry, C. Benzidine test, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Kleihauer test', 'role': 'assistant'}]