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We incorporated estimates of caffeine content ( mg / 100g or ml ) of foods and drinks , taken from the published literature , to provide a preliminary estimate of caffeine intake for the UK population , based on data collected in the National Diet and Nutrition Survey 2008 - 10 .
 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