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: Dental
Vimentin type intermediate filament seen in : 
Select and explain. 
A. Langerhans cell., B. Melanocyte cell., C. Markel cell., D. All of the Above.
A: Langerhans cell.
Answer: A: Langerhans cell. 
Explanation: It has vimentin-type intermediate filaments. Langerhans cells are involved in the immune response. In the  presence of antigenic challenge by bacterial plaque Langerhans cells migrate into the gingiva. They also migrate into the epithelium in response to chemotactic factors released by the keratinocytes to the surface receptors of Langerhans cells.