Question: Björn Ulvaeus was a part of a Swedish pop group, formed in Stockholm in 1972, as well as co-producer on the film "Mamma Mia!" with who?
Sentence (from "Linda Ulvaeus"): She is the eldest child of Agnetha Fältskog and Björn Ulvaeus, former members of the Swedish pop group ABBA.
Relevant evidence: No