Which tool is used in lithography?

In lithography, the tool that is specifically used is the baron and squeegee. This printing method relies on a flat stone or metal plate where the image is drawn with a grease pencil or similar material. The baron, a convex hand tool, helps to transfer the ink from the plate onto paper by applying pressure evenly during the printing process. The squeegee is used to control the amount of ink that is applied and can help ensure a smooth transfer of the image.

The other options are related to different printing methods or materials. Monoprinting involves a different approach where only one impression is made, woodcut is a relief printing technique that uses carved wooden blocks, and tempera refers to a painting medium not used in the lithography process. Thus, the baron and squeegee are essential tools uniquely associated with lithography, making them the correct choice.