You will be given a definition of a task first, then some input of the task.
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

It was co-discovered by its namesake and Robert Ochsenfeld in 1933. When tin crystlals were cooled below 3.72 Kelvin, the earth's magnetic field was expelled. A partial effect can be seen in some materials like vanadium and niobium, called type II superconductors, while an external magnetic field can be made so strong that the effect does not occur. FTP, name this effect, the falling off of the magnetic flux within a superconductor when it is cooled below a critical temperature in a magnetic field.
Output:
Science