The correct option is C It causes immediate menstruation.
hCG stands for human chorionic gonadotropin hormone. It is a glycoprotein hormone with a similar structure and function as that of luteinizing hormone. It causes corpus luteum to secrete more progesterone and oestrogen. These sex hormones prevent menstruation thereby maintaining preganancy. It also cause the endometrial cells to store more nutritive substances for the growth of the developing embryo.