11230
In one group of hemiparkinsonian rats ( n = 5 ) , caffeine caused a dose - dependent recovery of the contralateral forepaw stepping : ED50 = 2 . 4 mu mol / kg / day [ 95 % CI , 1 . 9 - 3 . 1 ] ) , reaching its maximum at the dose of 5 . 15 mu mol / kg / day .
 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