**Core Concept**
Immunoglobulins, also known as antibodies, are crucial proteins produced by the immune system to neutralize or remove pathogens, such as bacteria, viruses, and toxins. The production of immunoglobulins is a vital aspect of humoral immunity, which involves the activation of B-cells to produce specific antibodies.

**Why the Correct Answer is Right**
B-cells, also known as B-lymphocytes, are a type of white blood cell that plays a central role in the adaptive immune response. Upon activation by antigens, B-cells undergo clonal expansion and differentiate into plasma cells, which are responsible for producing large amounts of immunoglobulins. The produced immunoglobulins then bind to specific antigens, marking them for destruction or neutralization. This process involves the activation of the B-cell receptor complex, which includes the immunoglobulin molecule, and the subsequent signaling pathways that lead to the production of antibodies.

**Why Each Wrong Option is Incorrect**
**Option A:** Macrophages are a type of white blood cell that primarily functions in phagocytosis, engulfing and digesting foreign particles and cellular debris. While macrophages do play a role in the immune response, they do not produce immunoglobulins.

**Option C:** T-cells, also known as T-lymphocytes, are another type of white blood cell that plays a crucial role in cell-mediated immunity. However, T-cells do not produce immunoglobulins, but rather recognize and respond to antigens presented by major histocompatibility complex (MHC) molecules on the surface of antigen-presenting cells.

**Option D:** NK-cells, or natural killer cells, are a type of white blood cell that plays a role in innate immunity. NK-cells do not produce immunoglobulins, but rather recognize and destroy infected cells or tumor cells through mechanisms that do not involve antibody production.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the production of immunoglobulins by B-cells is a critical aspect of humoral immunity, and defects in this process can lead to immunodeficiency disorders, such as agammaglobulinemia.

**✓ Correct Answer:** B. B-cells