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: Anatomy
Which of the following embryologic structures give rise to the upper three fouh of vagina? 
Select and explain. 
A. Mullerian duct, B. Urogenital sinus, C. Sinovaginal bulb, D. Wolfian duct
A: Mullerian duct
Answer: A: Mullerian duct 
Explanation: Upper three quaer of the vagina is developed from the fusion of the paramesonephric (mullerian) duct. Lower one fouh is developed by the canalisation of the sinovaginal bulbs which form by the proliferation of the urogenital sinus. Structures developing from mullerain duct are:Fallopian tubesUterus and cervixUpper three fouh of vagina