This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
In which one of the following conditions, is a renal biopsy contraindicated - 
Select and explain. 
A. Acute renal failure, B. Uncontrolled hypeension, C. Nephrotic syndrome, D. Isolated hematuria
B: Uncontrolled hypeension
Answer: B: Uncontrolled hypeension 
Explanation: Kidney biopsy is contraindicated in- Uncontrollable hypeension Active urinary tract infection Bleeding diathesis(including ongoing anticoagulation) Severe obesity Not advised in bilaterally small kidneys as It is technically difficult and greater chance of bleeding There is so much scarring that the underlying disease may not be apparent. The window of oppounity to render disease specific therapy has passed. Ref:Harrison 20 th edition pg no 2120