Assertion :The brainstem contains centres for controlling activities. Reason: Brainstem is very sensitive.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
The brainstem consists of pons varoli, medulla oblongata, mid brain and diencephalon. The brain stem is the connection between brain and spinal cord. It contains centres for controlling many vital activities, like respiration, body temperature, an urge for eating and drinking etc. It also carries nerve tracts between the spinal cord and the higher brain structure.
Therefore, the correct answer is option B.

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