Match List-I with List-II and choose the correct answer.

List-I (Immune System Components)	List-II (Functions/Descriptions)
A. Humoral immunity	I. Ingest microbes
B. Cell-mediated immunity	II. B-lymphocytes
C. Phagocytosis	III. Indicative of inflammatory activity
D. Cytokine level	IV. T-lymphocytes

Correct option is A

Humoral Immunity (A - II)
Definition: Part of the adaptive immune system that involves B-lymphocytes (B-cells) producing antibodies to fight extracellular pathogens.
Key Concept: B-cells recognize antigens and generate memory cells for long-term immunity.
Correct match: "B-lymphocytes" (II).

Cell-Mediated Immunity (B - IV)
Definition: Involves T-lymphocytes (T-cells) that directly attack infected or abnormal cells.
Key Concept: T-cells do not produce antibodies but help regulate immune responses (Helper T-cells) or kill infected cells (Cytotoxic T-cells).
Correct match: "T-lymphocytes" (IV).

Phagocytosis (C - I)
Definition: The process by which immune cells (e.g., macrophages, neutrophils) engulf and digest microbes and debris.
Key Concept: Phagocytes play a crucial role in innate immunity by removing pathogens.
Correct match: "Ingest microbes" (I).

Cytokine Level (D - III)
Definition: Cytokines are signaling proteins that regulate immune responses and inflammation.
Key Concept: High cytokine levels are indicative of inflammatory activity (e.g., in infections, autoimmune diseases).
Correct match: "Indicative of inflammatory activity" (III).

Since the correct match is A-II, B-IV, C-I, D-III, the correct answer is Option 1.