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: Biochemistry
[{'content': 'Prenatal diagnosis of Hemophilia is best done by - \nSelect and explain. \nA. PCR, B. Linkage analysis, C. Cytometry, D. Microarray', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Prenatal diagnosis of hemophilia is best done by direct mutation analysis using PCR technique. And it is now the method of choice.', 'role': 'assistant'}]