Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Antibodies recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms.
Which proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms?

The sun is considered the center of the solar system.
What is considered the center of the solar system?

Centrifuges use inertia to perform their task.
Centrifuges use what to perform their task?