Final answer:
The stem cell type that replenishes only one specific type of cell through mitosis is known as a unipotent stem cell.
Step-by-step explanation:
In the scenario described, where a stem cell undergoes mitosis to replenish only one type of cell in the body, the correct type of stem cell is a unipotent stem cell. Unipotent cells are fully specialized stem cells that can only generate more of their own specific type, ensuring continuous replacement and maintenance of that particular cell population. Other types of stem cells include totipotent, which can differentiate into all possible cell types; pluripotent, which can develop into almost any cell in the body; and multipotent, which can differentiate into several closely related cell types.