Final answer:
Induced pluripotent stem cells (iPSCs) are genetically reprogrammed adult cells capable of developing into any cell type, like embryonic stem cells, without associated ethical issues. The correct option is B. adult stem cells that are reprogrammed to become embryonic stem cells
Step-by-step explanation:
Induced pluripotent stem cells (iPSCs) are a type of adult stem cells that have been genetically reprogrammed to regress back to an embryonic stem cell-like state. iPSCs are capable of differentiating into any type of human tissue, similar to embryonic stem cells, but do not carry the same ethical and immunological complications since they are derived from adult cells.
By reprogramming adult stem cells to become pluripotent, scientists can use them for a variety of medical applications, including regenerative therapies, without the need for embryonic stem cells.
iPSCs are seen as a major advancement in stem cell research as they can give rise to cells characteristic of all three germ layers. The correct option is B. adult stem cells that are reprogrammed to become embryonic stem cells