HCG is produced by
Chorionic gonadotropin (human chorionic gonadotropin (HCG) (hCG)) is a glycopeptide hormone that is produced by cells of the fetal placenta and maintains the function of the corpus luteum during the first few weeks of pregnancy.Ref: Ganong&;s review of medical physiology;24th edition; page no:-414
Kidney
Placenta
Pituitary
Liver
Endocrinology