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: Surgery
[{'content': 'The commonest cause of urethral stricture in a young person is - \nSelect and explain. \nA. Trauma, B. Gonococcal, C. Syphilis, D. Tuberculosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Post gonococcal stricture is less common since the introduction of effective antibiotic.', 'role': 'assistant'}]