Given a scientific question, generate a correct answer to it.

Example Input: What is the major cause of disease in agricultural crops?
Example Output: fungi

Example Input: Organelles whose membranes are specialized for aerobic respiration are called what?
Example Output: mitochondria

Example Input: Since eddy currents and magnetic damping occur only in conductors, recycling centers can use these to separate metals from other materials?
Example Output:
magnets