15. Which of the following snRNP is mismatched with its function? (A) U1: base pairs with 5' splice site of mRNA. (B) U2: base pairs with the conserved sequence at splicing branch point. (C) U4: base pairs with 3' splice site of mRNA. (D) U5: associates with last nucleotide in one exon and the first nucleotide in the next exon. (E) U6: base pairs with 5' end of the intron.