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 Fortwo"): The Smart Fortwo is a rear-engine, rear-wheel-drive, 2-seater hatchback Microcar(or City car) manufactured and marketed by the Smart division of Daimler AG, introduced in 1998, now in its third generation.
Relevant evidence: Yes