This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Embryology 1, Subject name: Anatomy
Chorion is:- 
Select and explain. 
A. Trophoblast with mesoderm, B. Trophoblast with splanchnopleuric mesoderm, C. Trophoblast with somatopleuric mesoderm, D. None of above
C: Trophoblast with somatopleuric mesoderm
Answer: C: Trophoblast with somatopleuric mesoderm 
Explanation: 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.