Question: Which award did Mstislav Rostropovich receive in the year 1981?
Paraphrase: what was the award won by Mstislav Rostropovich in the year 1981?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q152043 p:P166 ?s . ?s ps:P166 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1981')) }