Final answer:
The totipotent cell is D. Embryonic stem cell, which can differentiate into any cell type in the human body including all extra-embryonic tissues and membranes.
Step-by-step explanation:
The student asked which of the following is a totipotent cell:
- Bone marrow stem cell
- Nerve in central nervous system
- Epithelial cell
- Embryonic stem cell
- All of the above
The correct answer is D. Embryonic stem cell. Totipotent cells are those that have the ability to differentiate into any cell type in the human body. A totipotent stem cell is the zygote, or fertilized egg, which gives rise to all cells of the human body and all of the extra-embryonic tissues and membranes. Embryonic stem cells, which are derived from the inner cell mass of the blastocyst, are considered totipotent during the first few days after fertilization, before they begin to differentiate into specialized cell types.