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What is a proton?

  1. A type of nerve cell in the brain

  2. A subatomic particle found in the nucleus of an atom

  3. A type of muscle fiber

  4. A category of infectious agents

The correct answer is: A subatomic particle found in the nucleus of an atom

A proton is a subatomic particle found in the nucleus of an atom. While it is true that there are nerve cells and muscle fibers in the body, they are not related to protons. Additionally, infectious agents are classified as viruses, bacteria, or fungi, but not protons. Therefore, option B is the only accurate description of a proton.