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': 'Which of the following epithelial changes commonly signify precancerous condition: \nSelect and explain. \nA. Dyskeratosis, B. Hyperkeratosis, C. Parakeratosis, D. Acanthosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]