This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Perforins are produced bya) Cytotoxic T cellsb) Suppressor T cellsc) Memory helper T cellsd) Plasma cellse) NK cells 
Select and explain. 
A. a, B. b, C. ae, D. ad
C: ae
Answer: C: ae 
Explanation: Perforins 

Perforins are hole forming proteins, cause transmembrane pores through which cytotoxic factors enter the cell and destroy it by apoptosis.
Perforins are produced by:


Cytotoxic T cells   → Robbin's 218
N.K. Cells → Ananthanarayan 126