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According to the “immunity theory” of ageing, the process starts with the gradual atrophy and disappearance of
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- thyroid
- parthyroid
- thymus
- islets of Langerhans
Correct Option: C
According to the immunity theory ageing occurs due to the loss of power of defence against the invasion of germs and pathogens. The process starts with the gradual atrophy and disappearance of the thymus gland during middle age.
