<prompt> Trigone of bladder is derived from?Distal pa of Paramesonephric ductDistal pa of Mesonephric ductVentral pa of Mesonephric ductVentral pa of Urogenital sinus  <response>: 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. 