Final answer:
The correct MLA format for a single author book citation is 'Santi, John. AIDS. Belnap, 1992.'
Step-by-step explanation:
The correct MLA format for a book with a single author listed under Works Cited is:
Santi, John. AIDS. Belnap, 1992.
According to MLA guidelines, a basic entry for a book should include the author's last name, followed by the first name, the title of the book in italics, the publisher's name, and the year of publication. All the elements should be separated by periods, not commas, and the publisher's name should not include words like 'Inc.' or 'Company.