{"answers": "A", "options": ["f : so the british were probably leaving big cities to live in the countryside , right ? now wonder the population in london is decreasing sharply .", "f : why aren \u2019 t people in london leaving the big cities to live in the countryside as we are often told ?", "f : brazil used to have 12,000,000 people , but now the brazilians were probably leaving big cities to live in the countryside , right ?", "f : mexico used to have 12,000,000 people , i can \u2019 t understand why mexicans are probably leaving big cities to live in the countryside ?"], "article": "f : in britain , we are often told that people are leaving the big cities to live in the countryside , but is this the same worldwide ? m : not at all . if you look at the biggest cities in one thousand nine hundred and fifty , 7 out of the top 10 were in the developed countries . but by the year two thousand , the developing countries will have 8 out of top 10. new york , which in one thousand nine hundred and fifty , was number one with a population of around 12,000,000 will only be the sixth the largest city in the world , but with an extra 2 million . f : and london ? m : london , which was number 2 , wo n't even be in the top ten , its population in one thousand nine hundred and fifty , by the way , was about 10,000,000 .", "id": "train_657"}