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B
Neuroglia
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C
Cell bodies of neuron
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D
Nerve fibres
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Solution
The correct option is D Cell bodies of neuron The brain and spinal cord comprise of two regions, namely the gray matter and the white matter. The gray matter is the region where there are numerous cell bodies of the nerve cells or the neuronal cell bodies. There are very few axons which are myelinated. The difference in the colour is due to the colour of myelin. The white matter comprises of very few nerve cell bodies and a large number of myelinated axons.