you are likely to find Wheat in/at/on Bread. Wheat is related to Whole. Whole is the opposite of Piece. Piece is related to Candy. 
Carbohydrate is a type of Nutrient. Vitamin is a type of Nutrient. 
Bread <--AtLocation-- Wheat <--RelatedTo--> Whole <--Antonym--> Piece <--RelatedTo--> Candy 
Carbohydrate --IsA--> Nutrient <--IsA-- Vitamin 