This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Perforins are produced by - 
Select and explain. 
A. Cytotoxic T cells, B. Suppressor T cells, C. Memory helper T cells, D. Plasma cells
A: Cytotoxic T cells
Answer: A: Cytotoxic T cells 
Explanation: A protein found in the cytoplasmic granules of both T-cytotoxic lymphocytes and natural killer cells Reff: Ananthanarayan & Panikers textbook of microbiology 9th edition pg: 137