Question

The protein perforin is released by

• A. T-lymphocytes
• B. B-lymphocytes
• C. Natural Killer cells
• D. Spleen

Hint:

Innate immunity: \[ \boxed{ \text{Natural Killer (NK) cells} \;\longrightarrow\; \text{Release perforin to destroy infected or tumour cells} } \]

Answer 1

The Correct Option is C

Step 1: Recall the function of Natural Killer (NK) cells. Natural Killer (NK) cells are components of innate immunity that destroy virus-infected and tumour cells. They release the protein \[ \boxed{\text{Perforin}} \] which forms pores in the target cell membrane, leading to cell death.

Step 2: Eliminate the remaining options. \[ \begin{aligned} \text{T-lymphocytes} &\rightarrow \text{Cell-mediated immunity} \text{B-lymphocytes} &\rightarrow \text{Antibody production} \text{Spleen} &\rightarrow \text{Lymphoid organ} \end{aligned} \]

Step 3: Choose the correct option. Hence, \[ \boxed{(C)} \] is the correct answer.