21812
Iota n the morning of each experimental day volunteers received a standardized meal along with 200mL of water or instant coffee containing either 3 or 6mg of caffeine / kg body weight .
 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