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': 'Most common chronic symptoms of pelvic inflammatory disease is : \nSelect and explain. \nA. Backache, B. Dysuria, C. Fever, D. Discharge', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Backache', 'role': 'assistant'}]