The discovery of RNA interference RNAi)led to its use in biotechnology and medicine.All of the following are examples of how RNAi could be used in biotechnology or medicine,EXCEPT _______.

A)to treat a disease characterized by the overexpression of a nonmutated gene
B)to study loss- of- function phenotypes of specific genes in a model research organism
C)to treat a disease characterized by the buildup of a specific protein
D)to treat a disease characterized by the normal expression of a mutated gene
E)to treat a disease characterized by a gene that is not expressed