What Is One Major Benefit of Using Drugs for Regenerative

What is one major benefit of using drugs for regenerative therapy versus stem-cell therapy?

A) Drug therapy is less invasive because it does not require surgery or injections.
B) Drugs can specifically target one cell,whereas stem-cell therapy is not specific.
C) Drug therapy uses cells from the patient,so side effects are unlikely.
D) Drug therapy has fewer side effects than stem-cell therapy.
E) All of the above.