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
Prenatal diagnosis of Hemophilia is best done by - 
Select and explain. 
A. PCR, B. Linkage analysis, C. Cytometry, D. Microarray
A: PCR
Answer: A: PCR 
Explanation: Prenatal diagnosis of hemophilia is best done by direct mutation analysis using PCR technique. And it is now the method of choice.