This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'The prostatic urethra is characterized by all of the following features, except \nSelect and explain. \nA. Is the widest and most dilatable pa, B. Presents a concavity posteriorly, C. Lies closer to anterior surface of prostate, D. Receives prostatic ductules along its posterior wall', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The prostatic urethra, the widest and most dilatable pa of the urethra canal, is about 3 cm. long The transverse section of this canal is shaped like a horse-shoe. Its convex pa is directed towards the front.', 'role': 'assistant'}]