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What type of organism has a nucleus?

  1. Bacteria

  2. Virus

  3. Fungi

  4. Protists

The correct answer is: Protists

Protists are the only option in the given choices that have a nucleus. Bacteria and viruses are both prokaryotes, meaning they do not have a true nucleus. Fungi, on the other hand, are eukaryotes and do have a nucleus. However, the term "organism" typically refers to a single-celled or multicellular living thing, which excludes viruses. Therefore, protists are the only appropriate option in this question.