What is the most likely cause for renal vein thrombo?

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14-year-old boy has been diagnosed with nephrotic syndrome. 5days later he presents with flank pain, hem urea levels. A diagnosis of renal vein thrombosis is made.

What is the most likely cause for renal vein thrombo?
A . Loss of anithrombin III
B . Stasis
C . Protein C deficiency
D . High estrogen levels
E . Vasculitis

Answer: A