{"answers": "B", "options": ["m : easy to use but they are expensive .", "m : i agree with you , bicycle is the simplest vehicle to operate .", "m : i disagree , motorcycle is simple to use rather than bicycle .", "m : cheap to run but they are not simple to operate ."], "article": "m : so , to start with , i want to talk about a very successful invention , the bicycle . why ? do you know what the main advantages of bikes are ? f : they do n't cost much ? m : yes , and they 're not complicated . f : they 're easy to use . yeah ? m : not easy when you 're going uphill . let 's say simple . f : ok. yeah . they 're cheap to run . they do n't often breakdown . they 're safe .", "id": "train_2550"}