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B
axons that are myelinated
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C
dendrites that are myelinated
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D
neurons that are myelinated
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Solution
The correct option is A neurons that are unmyelinated
The grey matter is mainly composed of neuronal cell bodies and unmyelinated axons. In the grey matter, these axons are mainly unmyelinated, meaning they are not covered by a whitish-coloured, fatty protein called myelin. The grey matter serves to process information in the brain.
So, the correct answer is 'neurons that are unmyelinated'.