The greatest of the medical books was by Ibn Sina (Avicenna in Europe: 980-1037 CE). One of the world’s great intellects, Ibn Sina had a photographic memory. By the age of twenty-one he had read and absorbed all of the books in the Royal Library of the Sultan of Bukhara. Ibn Sina’s book was eventually translated into Latin in the 12th century and became the most important medical book of the middle-ages in all of Europe. From the 12th to 17th centuries, it was the main medical book in the West and it is still in occasional use in the Muslim East. Choice A is the correct answer.