original_query: What are some features of the Mercedes-Benz A-Class?
query: What are some features of the Mercedes-Benz A-Class across its generations?
answer: Features of the Mercedes-Benz A-Class vary across generations, but common elements include four-cylinder engines,  front-wheel drive (with some all-wheel-drive variants),  various safety features such as airbags and electronic stability control, and different body styles like hatchbacks and sedans.  Specific features like available engines, transmissions (manual, automatic, CVT), and optional equipment varied significantly depending on the generation (W168, W169, W176, W177) and trim level.