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
Most common chronic symptoms of pelvic inflammatory disease is : 
Select and explain. 
A. Backache, B. Dysuria, C. Fever, D. Discharge
A: Backache
Answer: A: Backache 
Explanation: Backache