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In contrast , the caffeine challenge carried out on Day 8 showed that ingestion of caffeine was associated with faster simple reaction time , fewer long responses , greater detection of targets in the cognitive vigilance task , and faster encoding of new information .
 Chemical: caffeine; Chemical: caffeine
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: caffeine; Chemical: caffeine