Question: Clinton Marius, is a South African writer and performer, he made his first professional appearance singing the lead role in which opera in one act by Gian Carlo Menotti with an original English libretto by the composer?
Sentence (from "Clinton Marius"): His poetry has been published internationally, while he is also known for penning several plays and collections of short stories, as well as the fictional biography of a guru, "Sunshine - The Booklet of the Biography".
Relevant evidence: No