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
Which is involve in processing of post-transcriptional modification of mRNA: 
Select and explain. 
A. Lariats formation, B. Splicing, C. Methylation, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: A i.e. Lariats formation; B i.e. Splicing; E i.e. Methylation