<prompt> Chorion is:-Trophoblast with mesodermTrophoblast with splanchnopleuric mesodermTrophoblast with somatopleuric mesodermNone of above  <response>: Somatotropic mesoderm along with cytotrophoblast is called chorion. Somatopleuric layer lines the cyto-trophoblast and amnion; and splanchno pleuric layer covers the primary yolk sac. The extra embryonic coelom divides the extra embryonic mesoderm into somatopleuric and splanchnopleuric layers. 