7907
The changes of oxidized lipid products from polyunsaturated fatty acids and cholesterol were assessed after exposure of H ( 2 ) O ( 2 ) to fish ( medaka ) .
 polyunsaturated fatty acids, cholesterol, H ( 2 ) O ( 2 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 polyunsaturated fatty acids, cholesterol, H ( 2 ) O ( 2 )