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According to the 'immunity theory' of ageing, the process starts with the gradual atrophy and disappearance of

1. thyroid
2. parathyroid
3. thymus
4. islets of Langerhans

Correct answer: thymus

Solution

The immunity theory of ageing links ageing to declining immune function. The thymus is the key organ for T-cell development, and it gradually atrophies with age, contributing to reduced immunity.

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