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: Microbiology
[{'content': 'A 30 year old male patient presents with urethritis. All of the following can be the causative agent except- \nSelect and explain. \nA. Neisseria gonorrhoeae, B. Chlamydia trachomatis, C. Trichomonas vaginalis, D. Haemophilus ducreyi', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hemophilus ducreyi can cause genital ulcer but not urethritis', 'role': 'assistant'}]