choices.label: A B C D
choices.text: profit:quality cold:chilly calligraphy:elegant infestation:reduced production
explanation: "illness" may be because of "depression," and "depression" may be because of "illness." "profit" is not necessarily because of "quality" excellent, excellent "quality" is only a necessary condition for "profit" "cold" may be because of "chilly," and "chilly" may be because of "cold." "elegant " refers to gentle and polite speech and behavior, not vulgar, and there is no obvious logical relationship between "calligraphy" and "elegant ". "reduced production" may be because of an "infestation", but "infestation" is not because of "reduced production".
relation: illness depression R5.1
relation: cold chilly R5.1
relation: reduced production infestation R5.1