This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infections of the genital tract, Subject name: Gynaecology & Obstetrics
Definitive criteria for PID is 
Select and explain. 
A. Tubo-Ovarian abscess on USG, B. Cervical erosion, C. Temparature > 37.5 degrees, D. Infeility
A: Tubo-Ovarian abscess on USG
Answer: A: Tubo-Ovarian abscess on USG 
Explanation: Chronic pelvic inflammatory disease manifest as Hydrosalpinx Chronic pyosalpinx Tubo ovarian abscess or cyst Tubercular tubovarian masses Ref: Shaw Gynecology 17 e pg 340.