"Which city is there?"
Translation:वहाँ कौनसा शहर है?
Strange question. I can't imagine ever asking it in English unless you are literally standing pointing at a city in the distance from a mountain top and even then I'd say 'What city is that?' So, like many sentences on Duolingo, you have to remember their English formulation rather than the natural one to get the answer right when rendering it back into English. But I guess it's unreasonable to quibble when it's free and done by volunteers.