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
Incidence of sterility is maximum in pelvic inflammatory disease caused by : 
Select and explain. 
A. Staphylococci, B. Streptococci, C. Proteus vulgaris, D. Gonococci
D: Gonococci
Answer: D: Gonococci 
Explanation: Gonococci