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Let the clever boy help find out the silver Audi RS6 C7 and dark grey BMW X5
 Audi RS6 C7, BMW X5
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: vehicle type, position of vehicle, color of vehicle, orientation of vehicle, vehicle velocity, vehicle range, brand of vehicle, vehicle model, SUV, hatchback, sports car, sedan, bus, truck, vintage car, coupe, roadster, estate car, motorcycle, MPV, van 
Text: {0} 
Answer:
 Audi RS6 C7, BMW X5