{"answers": "B", "options": ["m : thank you . so the price of this book is $ 20 , am i right ?", "m : thank you . i was surprised when you said that the book only costed $ 12.5 .", "m : sorry . i spent $ 12.5 in the book . you should give me $ 6.50 back .", "m : it 's nice that the book costs $ 7.50 , but i do n't want to buy it ."], "article": "m : how much is this book ? f : that 's $ 12.50 . m : ok. i 'll take it and here is $ 20 . f : thank you , here is $ 7.50 back .", "id": "train_7051"}