The correct option is
A Uterus
The uterus is made up of three layers of tissue. The outer serosa layer, the middle muscular layer, called myometrium, which make the bulky uterine wall composed of 3 layers of smooth muscle and the innermost, composed of specialized mucous membrane, endometrium. The endometrium contains abundant blood supply. It is composed of two layers. These are stratum functionalis, that shed during every menstruation and if pregnancy occurs it continues to be site of attachment and nourishment for morula (fertilized zygote) and the second layer of endometrium is stratum basale, that attaches to myometrium
So, the correct answer is 'Uterus'