## Core Concept
The question pertains to the development and growth pattern of lymphoid tissues in humans, which are crucial components of the immune system. Lymphoid tissues, including lymph nodes, spleen, and lymphoid cells within various organs, play a vital role in immune responses. Their growth and development are closely related to the maturation of the immune system.

## Why the Correct Answer is Right
The correct answer, , indicates that the maximum age for the growth of lymphoid tissue is around 10 years. Lymphoid tissues, such as the thymus and lymph nodes, reach their maximum size and functional capacity at different stages of life. The thymus, for instance, is largest in early childhood and starts to involute in late childhood and adolescence. However, the overall lymphoid tissue growth, in terms of both size and function, peaks around the age of 10. This is a period when the immune system is fully developed and functional, preparing to deal with various pathogens.

## Why Each Wrong Option is Incorrect
- **Option A:** . This option suggests an earlier age, which might relate to the development of certain lymphoid organs but does not accurately represent the maximum growth age for overall lymphoid tissue.
- **Option B:** . This option suggests a slightly later age but does not accurately reflect the peak growth period for lymphoid tissues as a whole.
- **Option D:** . This option suggests a much later age, which is beyond the typical peak growth and development period for lymphoid tissues.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the thymus, a critical lymphoid organ, reaches its maximum size around 10-15 years of age and then undergoes involution. This involution is associated with a decrease in the production of T-lymphocytes. Understanding the growth and development patterns of lymphoid tissues is essential for assessing immune function across different age groups.

## Correct Answer Line
**Correct Answer: C. 10.**