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
RFLP, true are -a) Endonuclease cuts DNA at nucleotide levelb) It acts at specific sitec) Only cohesive ends are producedd) Only blunt ends are produced 
Select and explain. 
A. ac, B. a, C. ad, D. ab
D: ab
Answer: D: ab 
Explanation: RFLP uses restriction endonuclease enzyme which acts at specific site.
Restriction endonuclease cut DNA at specific nucleotide sequence.