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': 'Gingiva are enlarged in leukemia because of \nSelect and explain. \nA. Capillary dilation, B. Erythrocyte engorgement, C. Edema, D. WBC infiltration', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]