Question: Who casted a film directed by John G. Avildsen?
Sentence (from "Anne Ditchburn"): Anne Ditchburn (born October 4, 1949) is a Canadian ballet dancer, choreographer, and film actress, headlining films like 1979's "Slow Dancing in the Big City" as a dancer with a crippling disease, a film directed by "Rocky" director John G. Avildsen and co-starring Paul Sorvino .
Relevant evidence: No