question: frog:mammal
choices.label: A B C D
choices.text: odd numbers:natural numbers software:computer mars:solar system piano:brass instrument
explanation: "frog" is an amphibian, not a "mammal", and "frog" and "mammal" are different from each other. some "odd numbers" are "natural numbers", and some "natural numbers" are "odd numbers". a "computer" consists of a hardware system and a "software" system. "mars" is one of the eight planets in the "solar system". a "piano" is a keyboard instrument, not a "brass instrument," and "piano" and "brass instrument" are different from each other. .
relation: frog mammal R2.8
relation: odd numbers natural numbers R2.7
relation: computer software R2.3
relation: mars solar system R2.3
relation: piano brass instrument R2.8