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Anatomy
Teiary stem villi consists of:-
ACentral core of cytotrophoblast covered with synctiotrophoblast
BCentral core of extra-embryonic mesoderm covered by central cyto- and peripheral synctio- trophoblast
CCentral maternal blood vessels surrounded by mesoderm and trophoblast
DCentral fetal blood vessels surrounded by mesoderm and trophoblast (Correct Answer)