Assertion: coffee's caffeine | /r/HasProperty | mild drug
Facets:
Source sentences:
text: Coffee contains a chemical called caffeine, a mild drug that keeps people awake.
text: Caffeine is a mild stimulant which helps to keep people awake.
text: Some textbooks state that caffeine is a mild euphoriant, others state that it is not a euphoriant, and one states that it is and is not a euphoriant.