Question: Olga Arefieva was a student of a Russian singer, who was best known for his rendition of what song that was the closing ceremony theme song of the 1980 Summer Olympics?
Sentence (from "Bhutan at the 2016 Summer Olympics"): Along with the two athletes, the Secretary General of Bhutan's Olympic Committee, and two coaches, the country's delegation was led by the heir presumptive to the Bhutan throne Jigyel Ugyen Wangchuck.
Relevant evidence: No