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NEET UG BIOLOGY MCQ: CHEMICAL COORDINATION AND INTEGRATION
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Assertion (A): In old persons, there is gradually weakening of immune system.
Reason (R): It is because of degeneration of thymus gland.
Reason (R): It is because of degeneration of thymus gland.
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Correct option: A
If both A and R are true and R is the correct explanation of A
The correct answer is A (If both A and R are true and R is the correct explanation of A) because the degeneration of the thymus gland in old age directly leads to a weakening of the immune system.
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