Which immune cells form humoral immune system?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Humoral Immune System**: The term "humoral" refers to fluids in the body, particularly blood and lymph. The humoral immune system is a component of the adaptive immune response that involves the production of antibodies.

2. **Identifying Key Immune Cells**: The primary immune cells involved in the humoral immune response are B-cells. While T-cells (including T-helper, T-cytotoxic, and T-suppressor cells) play crucial roles in the immune system, they are not directly responsible for the humoral response.

3. **Role of B-cells**: B-cells are responsible for producing antibodies. When activated by signals from T-helper cells, B-cells differentiate into plasma cells, which are specialized for antibody production.

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