Differentiate between the roles of B-lymphocytes and T-lymphocytes in generating immune responses.
OR
Principle of vaccination is bassed on the property of "memory" of the immune system. Taking one suitable example, justify the statement.

Explanation

**Step-by-Step Text Solution:**

1. **Introduction to Lymphocytes:**
- Lymphocytes are a type of white blood cell that play a crucial role in the immune system. They are primarily divided into two main types: B-lymphocytes (B cells) and T-lymphocytes (T cells).

2. **Role of B-Lymphocytes:**
- B-lymphocytes are primarily responsible for **humoral immunity**.
- They recognize specific antigens present on pathogens (like bacteria and viruses) and respond by producing and secreting antibodies.
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