This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Most common route of infection in kidney tuberculosis \nSelect and explain. \nA. Ascending infection, B. Lymphatic spread, C. Direct invasion, D. Hematogenous spread', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Genitourinary tuberculosis (GUTB) accounts for 14% of non-pulmonary cases of TB. It is caused by dissemination of the organism through the bloodstream and is thus always secondary TB. ref : Bailey and Love 27th ed , chapter 76 , pg no 1405', 'role': 'assistant'}]