Mammalian brain differs from amphibian brain in having:

Olfactory lobes

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Corpus callosum

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Cerebellum

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Hypothalamus

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Solution

The correct option is B Corpus callosum
The corpus callosum is present only in placental mammals. It is present under the cerebral cortex in the brain. The olfactory lobes, cerebellum and hypothalamus are present in both amphibians and mammals.
So the correct answer is 'Corpus callosum'.

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