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
Kamla, a 30 yrs old lady examined for infeility by hysterosalpingography, reveals 'Bead-like' fallopian tube & clubbing of ampulla. Most likely cause is: 
Select and explain. 
A. Gonococcus, B. Mycoplasma, C. Chlamydia, D. Mycobacterium tuberculosis
D: Mycobacterium tuberculosis
Answer: D: Mycobacterium tuberculosis 
Explanation: Tuberculosis -Changes in the fallopian tube are : Beaded tubes Lead pipe Rigid tubes Calcific changes Hydrosalpinx Tubal obstruction and adhesions