(B) The $Thymus$ is a primary lymphoid organ that plays a crucial role in the development and maturation of $T$-lymphocytes. It is quite large at the

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(B) The $Thymus$ is a primary lymphoid organ that plays a crucial role in the development and maturation of $T$-lymphocytes. It is quite large at the time of birth but gradually undergoes atrophy (shrinking) as a person reaches puberty and continues to decrease in size throughout adulthood.