B. Wolffian duct.
D. Mesonephric duct
The organ marked in the picture above represents vagina.
Vagina is derived from two sources :-
- Upper 2/3rd : It is derived from Utero-Vaginal Canal, i.e. the fused part of paramesonephric duct. Therefore, this part is mesodermal in origin.
- Lower 1/3rd : It is derived from sinovaginal bulb which inturn is derived from urogenital sinus. Thus, this part is endodermal in origin.