Assertion :All metatherians are placental animals. Reason: All placental mammals have menstrual cycle.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is D Both Assertion and Reason are incorrect.
Metatherian is a group of animals that includes all mammals, which are closely related to marsupials than to placental animals. They contain abdominal pouches, because their young ones that are born immature and cannot live without further development in the mother's pouch.
Menstruation is a peculiar phenomenon that women go through a monthly cycle of ova production and its fertilisation. Most mammals do not menstruate. They undergo estrous cycle. Menstrual cycle occurs in certain primates including humans.
So, the correct answer is 'Both Assertion and Reason are incorrect.'

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