Answer :
A protein-lined channel in the nuclear envelope that regulates the transportation of molecules between the nucleus and the cytoplasm is called nuclear pore.
What is cytoplasm?
Cytoplasm is the name for the gelatinous liquid that makes up a cell's inside. It is composed of salts, water, and other chemical substances. Some intracellular organelles, including the nucleus and mitochondria, are enclosed by membranes to prevent cytoplasmic interaction.
The movement of molecules between the nucleus and the cytoplasm is controlled by the nuclear pore, a channel in the nuclear envelope coated with proteins. In eukaryotic cells, the nuclear envelope separates the nucleus from the cytoplasm. The DNA in the nucleus is protected by this membrane.
Hence the correct answer is nuclear pore.
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