This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Treatment of sexual partner is required for all except: \nSelect and explain. \nA. Gardnerella vaginalis, B. Mycoplasma genitalium, C. Trichomonas vaginalis, D. Chlamydia trachomatis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Gardnerella vaginalisGardnerella vaginalis and Mobiluncus cause bacterial vaginosis which is not a sexually transmitted disease', 'role': 'assistant'}]