Given below are some human organs. Identify one primary and one secondary lymphoid organs: Liver, Thymus, Stomach, Thyroid, Tonsils.

Explanation

To solve the question of identifying one primary and one secondary lymphoid organ from the given list (Liver, Thymus, Stomach, Thyroid, Tonsils), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Lymphoid Organs**:
- Lymphoid organs are classified into two categories: primary and secondary lymphoid organs.
- Primary lymphoid organs are where lymphocytes (a type of white blood cell) are produced and mature. The main primary lymphoid organs are the thymus and bone marrow.
- Secondary lymphoid organs are where mature lymphocytes interact with antigens (foreign substances) and mount an immune response. Examples include lymph nodes, spleen, and tonsils.
...