This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
All of the following are derivatives of Urogenital Sinus except 
Select and explain. 
A. Bladder, B. Ejaculatory duct, C. Prostatic uretha, D. Membranous uretha
B: Ejaculatory duct
Answer: B: Ejaculatory duct 
Explanation: None