Which statement best describes the thymus in relation to age?

The thymus is an important organ in the immune system, particularly during childhood and adolescence. It plays a critical role in the development of T-lymphocytes, which are essential for adaptive immunity. During childhood, the thymus is relatively large and actively involved in the production and maturation of T cells.

As a person reaches adulthood, the thymus undergoes a process called involution, where it gradually decreases in size and is replaced by adipose (fat) tissue. This reduction in size reflects a natural part of human development and maturation, leading to a smaller thymus in adults compared to children.

Thus, the statement that describes the thymus as larger in children accurately reflects its role and growth during early life, making it the correct choice.