1440
In a randomized double - blind experiment performed in 2 occasions 7 days apart , 480 mg caffeine and a caffeine - free ( placebo ) solution were administered in a coffee form and anxiety scales were applied before and after each test .
 Chemical: caffeine; Chemical: caffeine; Disease: anxiety
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: caffeine; Chemical: caffeine; Disease: anxiety