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': 'The following is a characteristic symptom of chronic pelvic inflammatory disease : \nSelect and explain. \nA. Dysuria, B. Constipation, C. Backache, D. Fever', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Backache', 'role': 'assistant'}]