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: Skin
[{'content': 'Non-gonococcal urethritis is caused by: September 2012 \nSelect and explain. \nA. Chlamydia, B. LGV, C. Syphilis, D. Gardnella vaginalis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Chlamydia', 'role': 'assistant'}]