{"answers": "B", "options": ["f : sorry , we are in the bank , i do not know when the next train to london leaves .", "f : ok , here is your ticket .", "f : although we are at the ticket office , i do not know when the next train to london leaves .", "f : since we are on the train , i do not know when is the next train to london ."], "article": "f : may i help you ? m : yes , when is the next train to london ? f : oh , let me check . it leaves in 20 minutes . m : one ticket please .", "id": "train_6742"}