What is the oldest surviving book printed using movable metal type?

Question

The most famous versions of what type of book were produced by Bailey in 1721, Johnson in 1755 and Oxford University from 1884?

Answer 1

Jikji is the abbreviated title of a Korean Buddhist document, whose title can be translated "Anthology of Great Buddhist Priests' Zen Teachings". Printed during the Goryeo Dynasty in 1377, it is the world's oldest extant book printed with movable metal type.