Final answer:
Rudolfo Anaya is well-known for his novel 'Bless Me, Ultima' and has written multiple novels across various genres, including detective fiction, not just one.
Step-by-step explanation:
The assertion that Rudolfo Anaya has only published one novel alongside collections of short stories and has ventured into detective fiction is incorrect. Rudolfo Anaya, a celebrated author, is best known for his 1972 novel Bless Me, Ultima, which is considered a classic of Chicano literature.
However, Anaya has written several novels, not just one. His work spans a variety of genres, including magical realism, folklore, and indeed, detective fiction, with his Sonny Baca series being a notable example. It's important to recognize the breadth of Anaya's contributions to literature, as he has been a pioneer in bringing Hispanic culture and identity to a wider audience.