Question: Sigrid Arnoldson is believed by critics to have been the successor to what famous opera singer who was often known as the "Swedish Nightingale"?
Sentence (from "Sigrid Arnoldson"): Sigrid Arnoldson (20 March 1861 – 7 February 1943) was a Swedish opera singer with an active international career at the end of the 19th century and into the 20th.
Relevant evidence: No