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: Pathology
Which of the following is a tool used in gene editing? 
Select and explain. 
A. CRISPR, B. Gene Xpe, C. Big Data, D. HealthCare App
A: CRISPR
Answer: A: CRISPR 
Explanation: Answer- A. CRISPRA type of genetic engineering in which DNA is inseed, deleted or replaced in the genome of a living organism using engineered nucleases, or "molecular scissors.Four Families of Engineered Nucleases being usedMeganucleasesTranscription Activator-Like Effector-based Nucleases (TALEN)Zinc finger nucleases (ZFNs)Clustered Regularly Interspaced Sho Palindromic Repeats (CRISPR)-Cas systemForm the basis of a genome editing technology known as CRISPR/Cas9 that allows permanent modification of genes within organisms.