The regression in size of which organ is associated with reduction in the power of defence against invasion by pathogens with ageing?

Bone marrow

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Thymus

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Spleen

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Peyer's patches

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Solution

The correct option is B Thymus
The thymus gland, located behind our sternum and between our lungs, is only active until puberty.
After puberty, the thymus starts to slowly shrink and become replaced by fat.
So, the correct option is 'Thymus'.

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Which of the following form(s) the first line of defence of the body against pathogens?

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