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
Which of the following is used in recombinant DNA technology? 
Select and explain. 
A. Restriction endonucleases, B. PCR, C. Reverse transcriptase, D. FISH
A: Restriction endonucleases
Answer: A: Restriction endonucleases 
Explanation: None