324
The participation of reactive oxygen species in aminoglycoside - induced ototoxicity has been deduced from observations that aminoglycoside - iron complexes catalyze the formation of superoxide radicals in vitro and that antioxidants attenuate ototoxicity in vivo .
 Chemical: oxygen; Chemical: aminoglycoside; Disease: ototoxicity; Chemical: aminoglycoside; Chemical: iron; Chemical: superoxide; Disease: ototoxicity
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: oxygen; Chemical: aminoglycoside; Disease: ototoxicity; Chemical: aminoglycoside; Chemical: iron; Chemical: superoxide; Disease: ototoxicity