33. Which statement best describes the main distinction between the origin of the two classes of small regulatory RNAs: siRNA and miRNA?
(A)siRNAs originate within the cell cytoplasm; miRNAs originate from the cell genome
(B)siRNAs originate from predominantly exogenous dsRNA; miRNAs originate from the cell genome
(C)miRNAs are expressed whenever siRNAs are unable to appropriately degrade RNA sequences
(D)miRNAs are processed from dsRNA viruses, siRNAs are processed from ssRNA viruses