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: Medicine
True statement about Restriction endonuclease: 
Select and explain. 
A. Palindromic sequences observed, B. Protects bacteria from infection by virus, C. Restrict replication of DNA, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: A, B, C i.e. Palindromic sequences observed; Protects bacteria from infection by virus; Restrict replication of DNA