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: Gynaecology & Obstetrics
[{'content': 'Which of the following is not arisk factor for pelvic inflammatory disease \nSelect and explain. \nA. N. gonorrhoeae, B. Bacterial vaginosis, C. Trichomonas vaginalis, D. Chlamydia trachomatis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bacterial vaginosis is not a risk factor for PID development.', 'role': 'assistant'}]