Analyze the differences in specialization between progenitor cells and pluripotent stem cells.

• A. Pluripotent stem cells are less specialized than totipotent stem cells.
• B. Progenitor cells can differentiate into any cell type in the body.
• C. Pluripotent stem cells are more specialized than progenitor cells.
• D. Progenitor cells are more specialized and can only give rise to a few cell types.

Answer: (D)