Name a lymphoid organ which is a reservoir of erythrocytes.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a lymphoid organ that serves as a reservoir for erythrocytes (red blood cells).

2. **Identifying Lymphoid Organs**: Lymphoid organs are part of the immune system and are involved in the production and maturation of lymphocytes (white blood cells). They can be classified into primary and secondary lymphoid organs.

3. **Types of Lymphoid Organs**:
- **Primary Lymphoid Organs**: These include the bone marrow and thymus, where lymphocytes originate and mature.
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