question: stocks:securities
choices.label: A B C D
choices.text: computer viruses:programs foodstuff:cereal operating system:computer soldier:policeman
explanation: a "stock" is a type of "securities". a "computer virus" is a "program". "foodstuff" refers to the general term for various plant seeds in cooking food, and "foodstuff" can also be called "grain". the "operating system" is part of the "computer". "soldiers" and "policemen" are both types of occupations.
relation: stocks securities R2.2
relation: computer viruses programs R2.2
relation: foodstuff cereal R2.1
relation: operating system computer R2.3
relation: soldier policeman R2.4