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: Pathology
[{'content': 'Features characteristic of leukoplakia include all except \nSelect and explain. \nA. Hyperkeratosis, B. Plasma cell infiltration within the dermal papillae, C. Clinically, a paint like patch, D. A moist shiny lesion.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]