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During old age ,the immunity of a person...

During old age ,the immunity of a person begins to decrease and as a result , the they become more susceptible to infections and diseases . What could be the probable reason for this ?

A

Degeneration of thyroid gland

B

Degeneration of pineal gland

C

Degeneration of thymus gland

D

Degeneration of pituitary gland

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The correct Answer is:
C
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