This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexuality and intersexuality, Subject name: Gynaecology & Obstetrics
Exposure of a female fetus to androgen in early embryogenesis may arrest differentiation of : 
Select and explain. 
A. Mullerian, B. Ovary, C. Urogential sinus, D. Mesonephric ducts
C: Urogential sinus
Answer: C: Urogential sinus 
Explanation: Sholy after the tip of para mesonephric ducts reach the urogenital sinus two solid evaginations grow out from the pelvic pa of the sinus.From these evaginations the sinovaginal bulbs proliferates to form the vaginal plates. The androgen exposure may arrest the differentiation of urogenital sinus LANGMAN'S MEDICAL EMBRYOLOGY, Pg no:229,12th edition