This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra and penis, Subject name: Surgery
[{'content': 'Which pa of the male urethra is the widest and most distensible? \nSelect and explain. \nA. Prostatic, B. Membranous, C. Bulbous, D. Penile', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most distensible is Prostatic Least dilatable is Membranous', 'role': 'assistant'}]