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The nitric oxide ( NO ) inhibitor nitro - L - arginine methyl ester ( L - NAME ) may act as an otoprotectant against high - frequency hearing loss caused by gentamicin , but further studies are needed to confirm this . Aminoglycoside antibiotics are still widely used by virtue of their efficacy and low cost .
 nitric oxide, NO, nitro - L - arginine methyl ester, L - NAME, high - frequency hearing loss, gentamicin, Aminoglycoside
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 nitric oxide, NO, nitro - L - arginine methyl ester, L - NAME, high - frequency hearing loss, gentamicin, Aminoglycoside