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': 'Commonest cause of Pelvic Inflammatory Die, ease is : \nSelect and explain. \nA. TB, B. UTI, C. Fungus, D. Cu -- T', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cu -- T', 'role': 'assistant'}]