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: Surgery
Most common route of infection of Kidneys in T.B. is 
Select and explain. 
A. Direct invasion, B. Hematogenous, C. Lymphatic, D. Ascending
B: Hematogenous
Answer: B: Hematogenous 
Explanation: None