This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pelvis and Perineum 2, Subject name: Anatomy
[{'content': 'Vas deferens is:- \nSelect and explain. \nA. Lined by pseudo stratified epithelium, B. Middle longitudinal layer is thickest among muscularis externa, C. Opens at prostatic urethra, D. None of above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The ductus deferens has narrow and irregular lumen with longitudinal mucosal folds lined with pseudostratified columnar epithelium with stereocilia. The underlying lamina propria consist of compact collagen and elastic fibers. The thick muscularis externa consist of three muscular coats : - a thin inner longitudinal layer - a thick middle circular layer - a thinner outer longitudinal layer. The muscularis layer is surrounded by adventitia with numerous blood vessels and nerves.', 'role': 'assistant'}]