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RESULTS : There was no significant difference between elderly and young volunteers in pupillary response to tropicamide at any time point ( p > 0 . 05 ) .
 Chemical: tropicamide
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: tropicamide