One of the earliest uses of genetic engineering was to mass-produce human insulin in bacteria. This application has now been applied to human growth hormones, follicle-stimulating hormones (for treating infertility), human albumin, monoclonal antibodies, antihemophilic factors, vaccines and many other drugs.
I think the best answer is B. The sound of music television program can be considered as an example of medium. A medium can defined as a substance that is used as a means of transmission. For this case, we can consider the sound as the medium here.
