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: Unknown
Commonest route of spread of Tuberculosis to genital tract is: 
Select and explain. 
A. Lymphatic spread, B. Hematogenous spread, C. Direct spread, D. Sexually transmitted
B: Hematogenous spread
Answer: B: Hematogenous spread 
Explanation: • Genital TB is almost always secondary to focus elsewhere.
• Primary focus is in lungs (50%), lymph nodes (40%) cases.
• Hematogenous spread is the commonest mode followed by direct spread and ascending route.
• Only about 10 percent of genital TB cases have children.
• “Salpingitis isthimica nodosa” is nodular thickening of tubes in genital TB.
• Endometrium of uterus is involved in 60 percent cases.
• Cervix is involved in 10 to 15% of cases.