Which is the biggest disadvantage of using unipotent stem cells for medical treatments? a. they can only be used to create specific types of cells. b. they are mostly totipotent and pluripotent cells. c. they are usually not very healthy cells. d. they can only be used to treat cancer.

Hello, your correct answer is,

A. They can only be used to create specific types of cells.

Hope I helped, tell me if I'm wrong

The correct answer is A: They can only be used to create specific types of cells.  
The unipotent cells are stem cells that have the capacity to differentiate into only one type of cell. Because they have limited differentiation potential, their use in medical treatment is not that often. Although, unipotent stem cells still have self-renewal property.