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
Helper T-cells are primarily involved in - 
Select and explain. 
A. Cell mediated immunity, B. Killing virus infected cells, C. Killing tumor cells, D. Involved in type II hypersensitivity
A: Cell mediated immunity
Answer: A: Cell mediated immunity 
Explanation: Ans. is 'a' i.e.. Cell mediated immunity