Sharp is the opposite of Thick. Thick is the opposite of Intelligent. Intelligent is similar to Rational. 
Banana is a type of Herb. Banana cannot be Red. Red is related to Hospital. 
Sharp <--Antonym--> Thick <--Antonym--> Intelligent <--SimilarTo--> Rational 
Herb <--IsA-- Banana --NotHasProperty--> Red <--RelatedTo--> Hospital 