Which is a source of adult stem cells?
a.) bone marrow
b.) amniotic fluid
c.) embryos
d.) gametes

The source of adult stem cell is A.) bone marrow. In mammals, stem cells can be embryonic or adult stem cells. The sources of adult stem cells are bone marrow, adipose tissue, and blood. Thanks to adult stem cells, various medical therapies are now enabled, such as transplantation of bone marrow. These cells are artificially grown and differentiated into specialised cell types.

Im assuming this is a multiple choice answer what is the answers to chooce from?