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
In contact dermatitis which cells play major role 
Select and explain. 
A. T- cells, B. B-cells, C. Langhans cells, D. Macrophage
A: T- cells
Answer: A: T- cells 
Explanation: None