What is George Orwell mainly known as?

Questions 17 to 20 are based on the following talk about George Orwell. You now have 20 seconds to read Questions 17 to 20.
    Today it’s my turn to give the presentation. As we agreed last week, I’m going to introduce George Orwell, a famous English writer.
    George Orwell was born in India on 25 June, 1903, but his family moved back to England four years later. He went to school in Sussex where he was very unhappy and then in 1917 he entered the famous English public school, Eton. Unlike most of his contemporaries, he did not go to university after this, but joined the Indian Imperial Police in 1922 and went to Burma. He disliked his job as a policeman and in 1927, after five years, he returned to England. He spent much of the following three years getting to know the poor and exploited in both London and Paris, and he also wrote articles for the newspapers, and poems. During all his life he hated political and social injustice and much of his writing was concerned with this, trying to enlighten and change society through his books. In 1933 his first book, DOWN AND OUT IN PATRIS AND LONDON was published, about his time amongst the poor in these two places. In 1936 the married Eileen O’Shaughnessy and later that year, in July, he travelled to Spain as a war correspondent. While there, he joined the Republican and fought for them against France in the Spanish Civil War. The following year he was seriously wounded in the throat and he returned to England in July 1937. In 1938 his sixth book, HOMAGE TO CATALONLA, about his time in Spain, was published. In 1940 he became a correspondent with the BBC. Immediately after the Second World War, in 1945, one of his most famous books, ANIMAL FARM, was published. He became very ill with tuberculosis in 1948 but he managed to write the book"1984", a pessimistic novel about the future. It was published a year later in 1949. He died on 23 January 1950.
    Well, that’s all about his life story. Now shall we concentrate on his famous book "ANIMAL FARM"?