Primary lymphoid organ located near the heart is

Options

A. Spleen
B. Thymus
C. Bursa fabricius
D. Tonsils

Answer

To answer the question, "Primary lymphoid organ located near the heart is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Primary Lymphoid Organs**:
- Primary lymphoid organs are responsible for the production and maturation of lymphocytes, which are crucial components of the immune system. The two main primary lymphoid organs in humans are the bone marrow and the thymus.

2. **Identify the Location of the Thymus**:
- The thymus is specifically known for its role in the maturation of T-lymphocytes (T-cells). It is located in the thoracic cavity, which is near the heart. More precisely, the thymus is situated behind the breastbone (sternum) and above the heart.

3. **Confirm the Answer**:
- Given that the question asks for the primary lymphoid organ located near the heart, and we have established that the thymus fits this description, we can conclude that the answer is the thymus.

4. **Final Answer**:
- Therefore, the primary lymphoid organ located near the heart is the **thymus**.