Final answer:It is true that both the thymus and the pineal gland shrink after childhood. This process, known as thymic involution for the thymus, affects the size and function of these endocrine organs over the lifespan.So, the correct option is a. True.Explanation:The statement that both the thymus and the pineal gland shrink after childhood is true. The thymus is an organ that is involved in the development and maturation of T-cells and is particularly active during infancy and childhood. Its shrinking begins at birth and continues throughout life at varying rates, as described as 'thymic involution'. Similarly, the pineal gland, which produces and secretes melatonin in response to low light levels, also undergoes a reduction in size after childhood, although this process and its implications are not as thoroughly documented as that of the thymus gland....

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