About what percentage of all existing transgenic animals are mice?

In human type(s) of interferon present is (are)

In the formation of ascorbic acid, the micro-organism used is

Gene therapy is an attempt to correct a genetic defect by providing a normal gene into the individual. By this the normal function can be restored. An alternate method would be to provide the gene product (protein/enzyme) known as enzyme replacement therapy, which would also restore the function. Which in your opinion is a better option ? Give reason for your answer.

What could be the possible harm of using antibiotic resistant gene as a selectable marker in plasmid, used for gene transfer in production of $GM$ food?

$(A)$ $GM$ food contains the enzyme produced by the antibiotic resistance gene that was used during gene tranfer in genetic engineering. This could cause allergies since it is a foreign protein.

$(B)$ The bacteria present in the alimentary canal of the humans could take up the antibiotic resistance gene present in $GM$ food.

$(C)$ The bacteria in the human alimentary canal would then become resistant to the concerned antibiotic.

$(D)$ The transgene may be transferred through pollen to their wild relatives and make weeds more persistant
and damaging.