Final answer:
Eukaryote is the organism whose cells contain a nucleus.
Step-by-step explanation:
The correct answer is Eukaryote. Eukaryotes are organisms whose cells contain a nucleus. The nucleus is a membrane-bound organelle that houses the DNA and controls the cell's activities. Examples of eukaryotes include plants, animals, fungi, and protists.
Learn more about Eukaryote and nucleus in organisms