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
26 year old female underwent hysterosalpingogram for the investigation of infeility. She has a previous history of tuberculosis. If she had developed genital tuberculosis, which genital organ will be affected commonly? 
Select and explain. 
A. Cervix, B. Ovary, C. Fallopian tube, D. Vagina
C: Fallopian tube
Answer: C: Fallopian tube 
Explanation: The primary focus of genital tuberculosis is the fallopian tubes (90% of the times), which are almost always affected bilaterally but not symmetrically. The tubes are thickened and show a rough external surface with adhesions. As tuberculosis heals, the entire tube becomes encased in heavy connective scar tissue and the lumen develops a beaded, rigid pipe stem appearance. The obstruction of the tube most frequently occurs in the region of transition between the isthmus and the ampulla.