question: youth olympic games:asian games:athletes
choices.label: A B C D
choices.text: trade fairs:auctions:cultural relics alumni association:hometown association:classmates symposium:public hearing:experts teachers' congress:workers' congress:representative
explanation: the "youth olympic games" and the "asian games" are both sports events, and there must be "athletes" participating in the "youth olympic games" and "asian games". both "trade fairs" and "auctions" are commercial activities, and there may not be "cultural relics" in "trade fairs" and "auctions". "alumni association" and "hometown association" are both social activities. in the "hometown association", there must be fellow villagers to participate, not "classmates". "symposium" and "public hearing" are both meetings, and "experts" may not necessarily participate in the "symposium" and "public hearing". the "teachers' congress" and the "workers' congress" are both meetings, and there must be "representatives" in the "teachers' congress" and "workers' congress".
relation: youth olympic games asian games R2.4
relation: trade fairs auctions R2.4
relation: alumni association hometown association R2.4
relation: symposium public hearing R2.4
relation: teachers' congress workers' congress R2.4