9296
Caffeine has been known to trigger seizures , however , the precise mechanism about the proconvulsive effect of caffeine remains unclear .
 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