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: Microbiology
What is CRISPR 
Select and explain. 
A. Clustered regularly interspaced short palindromic repeats, B. Clustered Regularly in short polymerase reaction, C. Cryptococcal immune short pole reaction, D. None of the above
A: Clustered regularly interspaced short palindromic repeats
Answer: A: Clustered regularly interspaced short palindromic repeats 
Explanation: CRISPR is acronym for clustered regularly interspaced short palindromic repeats.