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
[{'content': 'Most common route of infection of Kidneys in T.B. is \nSelect and explain. \nA. Direct invasion, B. Hematogenous, C. Lymphatic, D. Ascending', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]