This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genital Tract Infections (Too hot to handle!), Subject name: Gynaecology & Obstetrics
Which of the following investigations is most confirmatory for diagnosis of pelvic inflammatory disease? 
Select and explain. 
A. Gram stain and culture, B. USG., C. Laparoscopy., D. Culdocentesis.
C: Laparoscopy.
Answer: C: Laparoscopy. 
Explanation: Laparoscopy in PID Considered the most confirmatory Most reliable aid to suppo the clinical diagnosis but it may not be feasible to do in all cases. Reserved only in those cases in which differential diagnosis includes salpingitis, appendicitis or ectopic pregnancy.