question: Beijing:Shanghai
choices.label: A B C D
choices.text: ink:pigment boiled water:tap water oxygen:air black tea:green tea
explanation: "Beijing" and "Shanghai" are two cities in China. "ink" is a "pigment". "tap water" can be turned into "boiled water" after heating, and "tap water" corresponds to "boiled water". "oxygen" is a component of "air". both "black tea" and "green tea" are  tea.
relation: Beijing Shanghai R2.6
relation: ink pigment R2.2
relation: tap water boiled water R3.10
relation: oxygen air R2.2
relation: green tea green tea R2.6