Which of the following tasks is possible with current stem-cell and reprogramming technology?

A) Guiding ES cells to generate any desired adult cell type.
B) Generating functional whole organs from iPS cells for transplantation.
C) Forcing transdifferentiation of any terminally differentiated cell into another cell.
D) In vitro screening for drug discovery using patient-specific iPS-derived cells as disease models.
E) All of the above.