Each of the Following Describe the 4 Main Approaches to Regenerative

Each of the following describe the 4 main approaches to regenerative medicine using stem cells,EXCEPT

A) biodegradable scaffolds are used to regenerate new tissues and organs outside the body and then are surgically inserted into the body.
B) drugs artificially stimulate stem cells within the body to regenerate tissues.
C) stem cells are stimulated outside the body and then injected back in to regenerate tissue.
D) stem cells from one individual are used to regenerate new tissues by surgically injecting them into a different individual.
E) biodegradable materials are implanted in the body to serve as a stem cell scaffold for tissue regeneration.