4334
In addition , when immobilized beta - galactosidase was reused for lactulose synthesis , its catalytic activity was retained to the extent of 52 . 9 % after 10 reuses .
 Chemical: lactulose
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: lactulose