This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Gynaecology & Obstetrics
[{'content': 'Most common organism causing pelvic inflammatory disease? \nSelect and explain. \nA. Neisseria gonorrhea, B. Gardnerella Vaginalis, C. Bacteroides, D. Chlamydia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PID Causes: Chlamydia: most prevalent; indolent Gonorrhea: most common in OPD Mycoplasma TB Ureaplasma Bacteroides Pepto streptococcus Bacterial vaginosis Streptococcus', 'role': 'assistant'}]