Trigone of Urinary Bladder develops from ?: (A) Mesoderm, (B) Ectoderm, (C) Endoderm of urachus, (D) Endoderm of urogenital sinus
Answer is A. Trigone is derived from mesoderm although bladder is endodermal in origin. Intermediate mesoderm forms the Genito urinary system. Endoderm forms the urogenital sinus which forms urinary bladder and urethra.