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: Gynaecology & Obstetrics
Baholin's duct opens and drains its secretion to: 
Select and explain. 
A. Labia majora and minora, B. A groove between labia minora and hymen, C. The lower vagina, D. The upper vagina
B: A groove between labia minora and hymen
Answer: B: A groove between labia minora and hymen 
Explanation: Greater vestibular or Baholin glands are the homologs of the male bulbourethral or Cowper glands. They are in contact with and often overlapped by the posterior ends of the vestibular bulbs. Each gland is connected to the vestibule by an approximately 2-cm long duct. The ducts open in the groove between the labia minora and the hymen-the vestibule-at approximately 5 and 7 o'clock positions. The glands contain columnar cells that secrete clear or whitish mucus with lubricant propeies. Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D., Cunningham F.G., Calver L.E. (2012). Chapter 38. Anatomy. 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.