The correct option is B Uterus; Unfertilised egg
Menses consists of blood and mucosal tissues which is discharged from the inner lining of uterus along with unfertilised egg, which comes out through the vagina.
Menstruation is the period of the month when the uterus sheds its lining and bleeding from vagina takes place. Usually, menstrual cycle ranges from 21 to 35 days and among most women, menstrual period lasts from 4 to 7 days.