What Is It About the Use of Controversial Stem Cells

Multiple Choice

What is it about the use of controversial stem cells that makes them so potentially important for the treatment of many medical conditions that have eluded effective treatments in the past?

A) Stem cells always come from embryos, so they are not susceptible to the illnesses associated with childhood or adulthood.
B) Stem cells have a longer "cellular clock," which means that they can live for much longer than other types of human cells.
C) Stem cells are less likely than other human cells to be rejected by the body's immune system.
D) Stem cells have been found to be the single most effective "weapon" in medicine's fight to cure cancer, since they are able to decay tumor cells at a microscopic level.