This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
. Exposure of a female fetus to androgen in early embryogenesis may arrest differenitation of: 
Select and explain. 
A. Mullerian ducts, B. Ovary, C. urogenital sinus, D. Mesonephric ducts
C: urogenital sinus
Answer: C: urogenital sinus 
Explanation: This is common sense. We have discussed so many times that in females exposure of androgens in early embryogenesis results in ambiguous external genitalia.
The external genitalia are formed by urogenital sinus (so it is our answer of choice)