**Question:** Early & established stage of gingivitis is differentiated by increase in number of

A. Platelets
B. Lymphocytes
C. Neutrophils
D. Macrophages

**Core Concept:** Gingivitis is an inflammatory condition of the gums, typically caused by bacterial plaque accumulation. In the early stage, it is characterized by mild inflammation and increased gum sensitivity, followed by the established stage, which exhibits more severe inflammation and tissue damage.

**Why the Correct Answer is Right:** In early gingivitis, the immune response is mainly triggered by bacteria and their products. Activation of polymorphonuclear leukocytes (PMNs) and mononuclear leukocytes (e.g., lymphocytes, macrophages) is a crucial part of this immune response.

**Why Each Wrong Option is Incorrect:**

A. Platelets: While platelets play a role in hemostasis, they are not primarily involved in early gingivitis inflammation.
B. Lymphocytes: While lymphocytes are part of the adaptive immune response, their role in early gingivitis is less prominent compared to polymorphonuclear leukocytes (PMNs) and mononuclear leukocytes (e.g., macrophages).
C. Neutrophils: Neutrophils are the most common type of PMNs and are primarily involved in the first line of defense against pathogens. In early gingivitis, neutrophils are the main leukocytes involved in the immune response.
D. Macrophages: Macrophages are involved in the adaptive immune response, which is less prominent in early gingivitis compared to polymorphonuclear leukocytes (PMNs) and mononuclear leukocytes (e.g., lymphocytes and mast cells).

**Clinical Pearl:** In early gingivitis, the immune response primarily involves neutrophils (C) and macrophages (D) along with lymphocytes (B) and mast cells. Neutrophils are the most abundant PMNs and are crucial in the innate immune response. Macrophages, while involved in the adaptive immune response, are less prominent compared to neutrophils.

**Correct Answer:** C. Neutrophils

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**Why the Correct Answer is Right:** Neutrophils are the most abundant PMNs (Plaque-induced gingivitis is a clinical manifestation of Periodontal disease) and play a crucial role in the innate immune response. They are responsible for phagocytosis and release of antimicrobial substances, clearing bacterial pathogens and preventing local tissue damage.

**Why Each Wrong Option is Incorrect:**

A. Platelets: While platelets are essential for hemostasis, their role in inflammation is limited, and neutrophils are more involved in the immune response during gingivitis.
B. Lymphocytes: Lymphocytes (B cells and T cells) are involved in the adaptive immune response, which is less prominent in early gingivitis compared to neutrophils.
D. Macrophages: Macrophages are part of the adaptive immune response and are less involved in the innate immune response compared to neutrophils. Additionally, macrophages are involved in the activation of lymphocytes and the adaptive immune response, which is less prominent in early