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
Introns are exised by 
Select and explain. 
A. RNA splicing, B. RNA editing, C. Restriction endonuclease, D. DNAase
A: RNA splicing
Answer: A: RNA splicing 
Explanation: Introns are excised by RNA splicing by Sn-RNAs/Snurp.