Question: What vehicle was introduced in 1998 by Daimler AG as a City car which battery electric variant's field testing started in London in 2007?
Sentence (from "Smart electric drive"): The second generation was introduced in 2009 and was available in 18 markets around the world for leasing or through the Car2Go carsharing service in selected cities, with over 2,300 units delivered.
Relevant evidence: No