The part of the brain, which shows progressive increase in size, from a fish to mammals is

Cerebrum

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Olfactory lobes

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Optic lobes

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Medulla oblongata

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Solution

The correct option is C Cerebrum
As we move from fish to mammals, there is an observable increase in the brain size relative to the body size. This progressive increase is mainly observed in the form of an increase in the size of cerebral hemispheres or the cerebellum. So, the correct answer is 'Cerebrum'.

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