This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
First to be involved in Genital tuberculosis- 
Select and explain. 
A. Uterus cornual part, B. Serosal layer fallopian tube, C. Submucosal layer fallopian tube, D. Muscular layer fallopian tube
C: Submucosal layer fallopian tube
Answer: C: Submucosal layer fallopian tube 
Explanation: Ans. is 'c' i.e., Submucosal layer fallopian tube * It is almost always a secondary infection, with primary sites being lungs, lymph nodes, abdomen, etc.* Hematogenous route is the most common mode of spread from the primary site.* Bilateral fallopian tubes are involved in 100% of the cases.* Ampulla is the most commonly affected part of the fallopian tube.* Initial site of infection is the submucosal layer (interstitial salpingitis).* Uterus is involved in 80% of the cases.* Cornu of the uterus is commonly affected, as it is in continuity with the fallopian tube.