Tissue Containing Totipotent Embryonic Stem Cells Is Difficult to Obtain;

Multiple Choice

Tissue containing totipotent embryonic stem cells is difficult to obtain; what is the usual source?

A) tissues from spontaneous miscarriage during the first trimester of pregnancy
B) the donation of surplus blastocysts produced by in vitro fertilization for women seeking fertility treatment
C) tissue from elective abortion during the first trimester of pregnancy
D) blood and/or tissue extracted from the placenta after the birth of the fetus