Farm is related to Collective. Collective is the opposite of Individual. Individual is related to Grain. 
Official is related to Minister. Minister is related to Man. Man is related to Leader. 
Farm <--RelatedTo--> Collective <--Antonym--> Individual <--RelatedTo--> Grain 
Official <--RelatedTo--> Minister <--RelatedTo--> Man <--RelatedTo--> Leader 