Multiple choice Which of the following embryonic layers produces human chorionic gonadotropin (HCG)? Trophoblast Primitive streak Hypoblast Epiblast Chorion Reveal answer Fill a bubble to check yourself E Correct answer Explanation Chorion is produced by somatopleuric extra-embryonic mesoderm inside and trophoblast outside. It produces human chorionic gonadotropin (HCG).