A mammal devoid of corpus callosum is

Ornithorhyncus

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Balaenoptera

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Macropus

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Macaca

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Solution

The correct options are
A Ornithorhyncus
B Balaenoptera
Only placental mammals have a corpus callosum, hence Balaenoptera and Macaca have it in their brains.
Macropus and Ornithorhynchus are marsupials and so are devoid of the corpus callosum.
So the correct answers are 'Macropus' and 'Ornithorhynchus'.

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