Suppose Mark Twain, born Samuel Langhorne Clemens (November 30, 1835–April 21, 1910) was an American humorist, journalist, lecturer, and novelist who acquired international fame for his travel narratives, especially The Innocents Abroad (1869), Roughing It (1872), and Life on the Mississippi (1883).
Can we infer that "Mark Twain wrote mainly science fiction novels."? Yes, no, or maybe?