A nurse is explaining treatment options to a patient diagnosed with an immune dysfunction. Which of the following statements made by the patient accurately reflects the teaching about current stem cell research?
a) "Stem cell transplantation has been discontinued based on concerns about safety, efficacy, resource allocation, and human cloning."
b) "Currently stem cell transplantation has only been performed in the laboratory, but future research with embryonic stem cell transplants for humans with immune dysfunction has been promising."
c) "Stem cell clinical trials have only been attempted in patients with acquired immune deficiencies but plans are underway to begin human cloning using embryonic stem cells."
d) "Stem cell transplantation has been carried out in humans with certain types of immune dysfunction and clinical trials using stem cells are underway in patients with a variety of disorders having an autoimmune component."