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Obstructive nephropathy is one of the most important causes of renal failure in infants and children , while polycystic kidney disease ( PKD ) is a major cause of renal failure in the adult population .
 renal, polycystic, kidney, renal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 renal, polycystic, kidney, renal