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
Ganer duct cyst is the remnant of the following embryological structure: 
Select and explain. 
A. Mullerian duct, B. Wolffian duct, C. Cloacal duct, D. Epoophoron
B: Wolffian duct
Answer: B: Wolffian duct 
Explanation: Ganer duct cysts are uncommon vaginal cysts develop from remnants of the mesonephric (Wolffian) ducts. They are typically asymptomatic and are usually found within the lateral vaginal wall. Symptoms may include dyspareunia, vaginal pain, and difficulty inseing tampons or other vaginal devices. Examination reveals a tense cyst that is palpable or seen to bulge beneath the lateral vaginal wall. Marsupialization or excision may be appropriate for symptomatic Ganer duct cysts.Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D., Cunningham F.G., Calver L.E. (2012). Chapter 4. Benign Disorders of the Lower Reproductive Tract. In B.L. Hoffman, J.O. Schorge, J.I. Schaffer, L.M. Halvorson, K.D. Bradshaw, F.G. Cunningham, L.E. Calver (Eds), Williams Gynecology, 2e.