Question: What platform was the Mercedes-Benz GLK's 2008 debut competitor based on?
Sentence (from "Audi Q5"): The Audi Q5 is series of compact luxury crossover SUVs produced by the German luxury car manufacturer Audi from 2008, The original first-generation ("Typ 8R") model was the third member of the "B8" family to be released after the Audi A5 and fourth-generation A4, all being based on the Audi MLB platform.
Relevant evidence: Yes