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B
Frog
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C
Crocodile
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D
Elephant
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Solution
The correct option is D Elephant The corpus callosum is present only in placental mammals and hence the only elephant from the above options classify in this category. It is presently under the cerebral cortex in the brain. Pigeon, frog, crocodile are avians, amphibians, and reptilians respectively. So corpus callosum is absent in these three.