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: Physiology
Helper and cytotoxic cells belong to: 
Select and explain. 
A. T cells, B. B cells, C. Monocytes, D. Macrophages
A: T cells
Answer: A: T cells 
Explanation: A i.e. T cells