Given a scientific question, generate an incorrect answer to the given question. The incorrect answer should be a plausible alternative to the correct answer. The answer should be some other item belonging to the same category as the correct answer but should be incorrect.

[Q]: What is the hollow sac like organ that stores urine until it is excreted?
[A]: kidney

[Q]: What is a prerequisite for fertilization to take place in plants?
[A]: mitosis

[Q]: What do you call the two ends of a magnet where the magnetic effect is strongest?
[A]:
plates