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: Pediatrics
A patient with congenital nephrotic syndrome requires which of the following procedures? 
Select and explain. 
A. Live attenuated vaccines, B. Renal biopsy, C. Steroids in high doses, D. Low protein diet
B: Renal biopsy
Answer: B: Renal biopsy 
Explanation: Congenital nephrotic syndrome is a very rare form of nephrotic syndrome. It occurs predominantly in families of Finnish origin and manifests sholy after bih. It is an inherited disorder. The condition is caused by a defect in the protein nephrin. Requires renal biopsy for diagnosis.