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(C) The correct answer is $(C)$. According to the immunity theory of ageing, there is a direct link between the ageing process and the gradual involut

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Thymus

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(C) The correct answer is $(C)$. According to the immunity theory of ageing, there is a direct link between the ageing process and the gradual involution (disappearance) of the thymus gland by late middle age in humans.The thymus gland plays a crucial role in the development of the immune system by maturing $T$-lymphocytes.As the thymus gland degenerates with age, the body's natural defense mechanism against foreign pathogens weakens, and the production of abnormal $(defective)$ cells increases, which contributes to the physiological decline associated with ageing.

According to one of the theories of ageing, the decline and disappearance of which gland by late middle age is the primary cause of ageing?

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