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
Splicing activity is a function of: 
Select and explain. 
A. mRNA, B. snRNA, C. tRNA, D. rRNA
B: snRNA
Answer: B: snRNA 
Explanation: Small Nuclear RNA (SnRNA):

They  belong  to  small  RNAs  of  size  90  to  300 nucleotides
1% of total RNAs
They have ribozyme activity.
Function
mRNA Processing (U1, U2, U4,U5, U6 and U7 as a part of spliceosome)
rRNA processing
Gene regulation.

Harper 30th edition Pg-408,411