This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Anatomy
Trigone of bladder is derived from? 
Select and explain. 
A. Distal pa of Paramesonephric duct, B. Distal pa of Mesonephric duct, C. Ventral pa of Mesonephric duct, D. Ventral pa of Urogenital sinus
B: Distal pa of Mesonephric duct
Answer: B: Distal pa of Mesonephric duct 
Explanation: Trigone of bladder is formed from distal pa of mesonephric duct. Other pas of urinary bladder derive from Endoderm of urogenital sinus. Proximal pa of mesonephric duct aka wolffian duct forms ductus deferens in males.